Derivative this (1) (−5x2−7x)e^4x

The integrating factor to make the given ODE exact is x+y.

To determine the integrating factor for the given ODE, we can use the condition for exactness of a first-order ODE, which states that if the equation can be expressed in the form M(x, y)dx + N(x, y)dy = 0, and the partial derivatives of M with respect to y and N with respect to x are equal, i.e., (M/y) = (N/x), then the integrating factor is given by the ratio of the common value of (M/y) = (N/x) to N.

In the given ODE, we have M(x, y) = 2y² + 3x and N(x, y) = 2xy.

Taking the partial derivatives, we have (M/y) = 4y and (N/x) = 2y.

Since these two derivatives are equal, the integrating factor is given by the ratio of their common value to N, which is (4y)/(2xy) = 2/x.

Therefore, the integrating factor to make the ODE exact is x+y.

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The roots of the equation are;

a. (n +2)(n -8)

b. (x-5)(x-3)

From the information given, we have the expressions as;

f(x) = n² - 6n - 16

Using the factorization method, we have to find the pair factors of the product of the constant and x square, we have;

a. n² -8n + 2n - 16

Group in pairs, we have;

n(n -8) + 2(n -8)

Then, we get;

(n +2)(n -8)

b. y = x² - 8x + 15

Using the factorization method, we have;

x² - 5x - 3x + 15

group in pairs, we have;

x(x -5) - 3(x - 5)

(x-5)(x-3)

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Answer: A) Yes, mold A is an exponential function that decreases faster than mold B, which is eventually an increasing quadratic function.

Step-by-step explanation:

To determine whether the number of spores in mold B will ever be larger than in mold A, we need to compare the growth patterns of the two functions. The function f(x) = 100(0.75)^(x-1) represents mold A, and it is an exponential function. Exponential functions decrease as the exponent increases. In this case, the base of the exponential function is 0.75, which is less than 1. Therefore, mold A is a decreasing exponential function. The function g(x) = 100(x-1)^2 represents mold B, and it is a quadratic function. Quadratic functions can have either a positive or negative leading coefficient. In this case, the coefficient is positive, and the function represents a parabola that opens upwards. Therefore, mold B is an increasing quadratic function. Since mold B is an increasing function and mold A is a decreasing function, there will be a point where the number of spores in mold B surpasses the number of spores in mold A. Thus, the correct answer is:

A) Yes, mold A is an exponential function that decreases faster than mold B, which is eventually an increasing quadratic function.

a) Equilibrium points: x ≈ -0.845, x ≈ 1.223.

b)  The equilibrium points are given by y = 0 and y = e^(ay), where a > 0.

c)  This equation has no solution, there are no equilibrium points for this differential equation.

d)  ln(0) is undefined, so there are no equilibrium points for this differential equation

a) To find the equilibrium for the differential equation x^2 = (1 - x)(1 - e^(-2x)), we can set the right-hand side equal to zero and solve for x:

x^2 = (1 - x)(1 - e^(-2x))

Expanding the right-hand side:

x^2 = 1 - x - e^(-2x) + x * e^(-2x)

Rearranging the equation:

x^2 - 1 + x + e^(-2x) - x * e^(-2x) = 0

Since this equation is not easily solvable analytically, we can use graphical methods to find the equilibrium points. We plot the function y = x^2 - 1 + x + e^(-2x) - x * e^(-2x) and find the x-values where the function intersects the x-axis:

Equilibrium points: x ≈ -0.845, x ≈ 1.223.

b) To find the equilibrium for the differential equation y' = y^2 (1 - ye^(-ay)), where a > 0, we can set y' equal to zero and solve for y:

y' = y^2 (1 - ye^(-ay))

Setting y' = 0:

0 = y^2 (1 - ye^(-ay))

The equation is satisfied when either y = 0 or 1 - ye^(-ay) = 0.

1 - ye^(-ay) = 0

ye^(-ay) = 1

e^(-ay) = 1/y

e^(ay) = y

This implies that y = e^(ay).

Therefore, the equilibrium points are given by y = 0 and y = e^(ay), where a > 0.

c) To find the equilibrium for the differential equation R' = -1, we can set R' equal to zero and solve for R:

R' = -1

Setting R' = 0:

0 = -1

Since this equation has no solution, there are no equilibrium points for this differential equation.

d) To find the equilibrium for the differential equation z = -ln(z), we can set z equal to zero and solve for z:

z = -ln(z)

Setting z = 0:

0 = -ln(0)

However, ln(0) is undefined, so there are no equilibrium points for this differential equation.

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The value of c is -1, and the coordinates (n) at which the graphs of f and g touch each other are (1, 0). The position (E, n) refers to the point of tangency between the two graphs. The graph of g passes near the point of tangency above the graph of f.

To determine the value of c and the coordinates (n) at which the graphs of f and g touch each other, we need to find the point of tangency between the two curves. Given that f(x, y) = x+y and g(x, y) = x² + y² + c, we can set them equal to each other to find the common point of tangency:

x+y = x² + y² + c

Since the point of tangency is (x, y) = (1, 0), we substitute these values into the equation:

1 + 0 = 1² + 0² + c

1 = 1 + c

Simplify the equation to solve for c:

c = -1

The coordinates (n) at which the graphs touch each other are (1, 0).

The position (E, n) refers to the point of tangency, which in this case, is (1, 0).

To determine which graph passes near the point of tangency above the other, we compare the shapes of the graphs. The graph of f is a straight line, and the graph of g is a parabola.

By visualizing the graphs, we can see that the graph of g (the parabola) passes near the point of tangency (1, 0) above the graph of f (the straight line)

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Answer:

Cannot be determined

Step-by-step explanation:

a. The hypotheses are:

H0: μ ≥ 857.50 (null hypothesis) HA: μ < 857.50 (alternative hypothesis)

b-1. We need more information to calculate the test statistic.

b-2. We need more information to calculate the p-value.

c. To determine the conclusion, we need to compare the p-value to the level of significance (α).

If the p-value is less than α (0.05), we reject the null hypothesis (H0). If the p-value is greater than or equal to α (0.05), we fail to reject the null hypothesis (H0).

We do not have the p-value to compare with α yet, so we cannot make a conclusion.

Therefore, the answer to multiple choice 1 is H0: μ ≥ 857.50; HA: μ < 857.50, and the answer to multiple choice 2 is cannot be determined yet.

The roots of the given equation X³ - 6x² + 11x - 6 = 0 are x = 1, x = 2, and x = 3.

To find the roots of the equation X³ - 6x² + 11x - 6 = 0, we can use various methods, such as factoring, synthetic division, or the rational root.

Let's use the rational root theorem to find the potential rational roots and then use synthetic division to determine the actual roots.

The rational root theorem states that if a polynomial equation has a rational root p/q, where p is a factor of the constant term and q is a factor of the leading coefficient, then p/q is a potential root of the equation.

The constant term is -6, and the leading coefficient is 1. So, the possible rational roots are the factors of -6 divided by the factors of 1.

The factors of -6 are ±1, ±2, ±3, ±6, and the factors of 1 are ±1.

The potential rational roots are ±1, ±2, ±3, ±6.

Now, let's perform synthetic division to determine which of these potential roots are actual roots of the equation:

1 | 1 -6 11 -6

| 1 -5 6

1  -5   6   0

Using synthetic division with the root 1, we obtain the result of 0 in the last column, indicating that 1 is a root of the equation.

Now, we have factored the equation as (x - 1)(x² - 5x + 6) = 0.

To find the remaining roots, we can solve the quadratic equation x² - 5x + 6 = 0.

Factoring the quadratic equation, we have (x - 2)(x - 3) = 0.

So, the roots of the quadratic equation are x = 2 and x = 3.

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The cost of food and beverages for one day at a local café was $224.80 and the total sales for the day were $851.90. The total cost percentage for the café was 26.39%.

We have to identify the total cost percentage for the café. The formula for calculating the cost percentage is given as follows:

Cost Percentage = (Cost/Revenue) x 100

For the problem,

Revenue = $851.90

Cost = $224.80

Cost Percentage = (224.80/851.90) x 100 = 26.39%

Therefore, the total cost percentage for the café is 26.39%. This means that for every dollar of sales, the café is spending approximately 26 cents on food and beverages. In other words, the cost of food and beverages is 26.39% of the total sales.

The cost percentage is an important metric that helps businesses to determine their profitability and make informed decisions regarding pricing, expenses, and cost management. By calculating the cost percentage, businesses can identify areas of their operations that are eating into their profits and take steps to reduce costs or increase sales to improve their bottom line.

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We have to prove that the series-sum game has value v₁+v₂, given that G; has value vi for i=1,2. We can choose R₁, R₂, C₁, and C₂ independently, we can write the value of the series-sum game as v₁+v₂.

Given that G; has value vi for i = 1, 2, we need to prove that their series-sum game has value v₁ + v₂. Here, the series-sum game is played as follows:
The row player chooses either the first or the second game (Gi or G₂). After that, the column player chooses one game from the remaining one. Then both players play the chosen games sequentially.
Since G1 has value v₁, we know that there exist row and column strategies such that the value of G1 for these strategies is v₁. Let's say the row strategy is R₁ and the column strategy is C₁. Similarly, for G₂, there exist row and column strategies R₂ and C₂, respectively, such that the value of G₂ for these strategies is v₂.
Let's analyze the series-sum game. Suppose the row player chooses G₁ in the first stage. Then, the column player chooses G₂ in the second stage. Now, for these two choices, the value of the series-sum game is V(R₁, C₂). If the row player chooses G₂ first, the value of the series-sum game is V(R₂, C₁). Let's add these two scenarios' values to get the value of the series-sum game. V(R₁, C₂) + V(R₂, C₁)
Since we can choose R₁, R₂, C₁, and C₂ independently, we can write the value of the series-sum game as v₁+v₂. Hence, the proof is complete.

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To calculate Manuel's monthly payments, we need to use the formula for a fixed-rate mortgage payment:

Monthly Payment = P * r * (1 + r)^n / ((1 + r)^n - 1)

Where:

P = Loan amount = $300,000

r = Monthly interest rate = 5.329% / 12 = 0.04441 (decimal)

n = Total number of payments = 30 years * 12 months = 360

Plugging in the values, we get:

Monthly Payment = 300,000 * 0.04441 * (1 + 0.04441)^360 / ((1 + 0.04441)^360 - 1) ≈ $1,694.18

Manuel will make monthly payments of approximately $1,694.18.

To calculate the total amount Manuel pays to the bank, we multiply the monthly payment by the number of payments:

Total Payment = Monthly Payment * n = $1,694.18 * 360 ≈ $610,304.80

Manuel will pay a total of approximately $610,304.80 to the bank.

To calculate the total interest paid by Manuel, we subtract the loan amount from the total payment:

Total Interest = Total Payment - Loan Amount = $610,304.80 - $300,000 = $310,304.80

Manuel will pay approximately $310,304.80 in interest.

To compare Michele and Manuel's interest, we need the interest amount paid by Michele. If you provide the necessary information about Michele's loan, I can make a specific comparison.

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An equation for the function graphed above is g(x) = |x - 1| - 2.

In Mathematics and Geometry, the translation of a graph to the right means adding a digit to the numerical value on the x-coordinate of the pre-image;

g(x) = f(x - N)

By critically observing the graph of this absolute value function, we can reasonably infer and logically deduce that the parent absolute value function f(x) = |x| was vertically translated to the right by 1 unit and 2 units down, in order to produce the transformed absolute value function g(x) as follows;

f(x) = |x|

g(x) = f(x - 1)

g(x) = |x - 1| - 2

In conclusion, the value of the variables A, B, and C are 4, 2, and 8 respectively.

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Answer:

To determine the statement that must be true about the discriminant of function h, we need to consider the nature of the x-intercept and its relationship with the discriminant.

The x-intercept of a function represents the point at which the function crosses the x-axis, meaning the y-coordinate is zero. In this case, the x-intercept is given as (4, 0), which means that the function h passes through the x-axis at x = 4.

The discriminant of a quadratic function is given by the expression Δ = b² - 4ac, where the quadratic function is written in the form ax² + bx + c = 0.

Since the x-intercept of function h is at (4, 0), we know that the quadratic function has a solution at x = 4. This means that the discriminant, Δ, must be equal to zero.

Therefore, the correct statement about the discriminant D is:

C. D = 0

Answer:

C. D = 0

Step-by-step explanation:

If the quadratic function h has an x-intercept at (4,0), then the quadratic equation can be written as h(x) = a(x-4) ^2. The discriminant of a quadratic equation is given by the expression b^2 - 4ac. In this case, since the x-intercept is at (4,0), we know that h (4) = 0. Substituting this into the equation for h(x), we get 0 = a (4-4) ^2 = 0. This means that a = 0. Since a is zero, the discriminant of h(x) is also zero. Therefore, statement c. d = 0 must be true about d, the discriminant of function h.

The required solutions are:

a) There are 360 different anagrams that can be made from the word "rakkar."

b) There are 120 different combinations of short answer questions that Peter can choose to answer.

c) There are 420 different relay teams that can be formed with two girls and two boys from the given group of athletes.

a) To find the number of anagrams that can be made from the word "rakkar," we need to calculate the number of permutations of the letters. Since "rakkar" has repeated letters, we need to account for that.

The word "rakkar" has 6 letters, including 2 "r" and 1 each of "a," "k," "a," and "k."

The number of anagrams can be calculated using the formula for permutations with repeated elements:

Number of Anagrams = 6! / (2! * 1! * 1! * 1! * 1!) = 6! / (2!)

Simplifying further:

6! = 6 * 5 * 4 * 3 * 2 * 1 = 720

2! = 2 * 1 = 2

Number of Anagrams = 720 / 2 = 360

Therefore, there are 360 different anagrams that can be made from the word "rakkar."

b) If Peter has to answer three short answer questions out of a set of questions, we can calculate the number of combinations using the formula for combinations.

Number of Combinations = nCr = n! / (r! * (n-r)!)

In this case, n represents the total number of questions available, and r represents the number of questions Peter has to answer (which is 3).

Assuming there are a total of 10 short answer questions:

Number of Combinations = 10C3 = 10! / (3! * (10-3)!)

Simplifying further:

10! = 10 * 9 * 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1 = 3,628,800

3! = 3 * 2 * 1 = 6

(10-3)! = 7!

Number of Combinations = 3,628,800 / (6 * 5,040) = 120

Therefore, there are 120 different combinations of short answer questions that Peter can choose to answer.

c) To form a relay team with two girls and two boys from a group of 12 athletes (8 boys and 4 girls), we can calculate the number of combinations using the formula for combinations.

Number of Combinations = [tex]^nC_r[/tex] = n! / (r! * (n-r)!)

In this case, n represents the total number of athletes available (12), and r represents the number of athletes needed for the relay team (2 girls and 2 boys).

Number of Combinations = [tex]^4C_2 * ^8C_2[/tex] = (4! / (2! * (4-2)!) ) * (8! / (2! * (8-2)!) )

Simplifying further:

4! = 4 * 3 * 2 * 1 = 24

2! = 2 * 1 = 2

(4-2)! = 2!

8! = 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1 = 40,320

2! = 2 * 1 = 2

(8-2)! = 6!

Number of Combinations = (24 / (2 * 2)) * (40,320 / (2 * 720)) = 6 * 70 = 420

Therefore, there are 420 different relay teams that can be formed with two girls and two boys from the given group of athletes.

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The roots of the equations are approximately:

Equation 1: z ≈ ±0.855 - 2.488i, ±0.855 + 2.488i

Equation 2: z ≈ 3

To find the roots of the equations, let's solve them one by one:

Equation 1: (5.1)z⁴ + 16 = 0

To solve this equation, we can start by subtracting 16 from both sides:

(5.1)z⁴ = -16

Next, we divide both sides by 5.1 to isolate z⁴:

z⁴ = -16/5.1

Now, we can take the fourth root of both sides to solve for z:

z = ±√(-16/5.1)

Since the fourth root of a negative number exists, the solutions are complex numbers.

Equation 2: z³ - 27 = 0

To solve this equation, we can add 27 to both sides:

z³ = 27

Next, we can take the cube root of both sides to solve for z:

z = ∛27

The cube root of 27 is a real number.

Let's calculate the roots using a calculator:

For Equation 1:

z ≈ ±0.855 - 2.488i

z ≈ ±0.855 + 2.488i

For Equation 2:

z ≈ 3

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First find the distance traveled at the first speed then we find the distance traveled at the second speed:

The car travels at a speed of "m" miles per hour for 3 hours.

Distance traveled in Part 1 = Speed * Time = m * 3 miles

The car travels at half that speed for 2 hours.

Speed in Part 2 = m/2 miles per hour

Time in Part 2 = 2 hours

Distance traveled in Part 2 = Speed * Time = (m/2) * 2 miles

Total distance traveled = m * 3 miles + (m/2) * 2 miles

Total distance traveled = 4m miles

Therefore, the total distance traveled by the car is 4m miles.

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Answer:

The value is,

[tex]x^2 + y^2 = 55[/tex]

55

Step-by-step explanation:

Now, we know that,

xy = 15, x-y = 5

using,

x - y = 5

squaring both sides and simplifying, we get,

[tex]x-y=5\\(x-y)^2=5^2\\(x-y)^2=25\\x^2+y^2-2(xy)=25\\but\ we \ know\ that,\ xy = 15\\so,\\x^2+y^2-2(15)=25\\x^2+y^2-30=25\\x^2+y^2=25+30\\x^2+y^2=55[/tex]

Hence x^2 + y^2 = 55

If a cyclist travels from city A to city B at a constant speed of 12 km/h and takes 2 hours, it would take 3 hours to complete the same trip at a speed of 8 km/h.

To determine the time it would take to make the same trip at 8 km/h, we can use the concept of speed and distance. The relationship between speed, distance, and time is given by the formula:

Time = Distance / Speed

In the given scenario, the cyclist travels from city A to city B at a constant speed of 12 km/h and takes 2 hours to complete the journey. This means the distance between city A and city B can be calculated by multiplying the speed (12 km/h) by the time (2 hours):

Distance = Speed * Time = 12 km/h * 2 hours = 24 km

Now, let's calculate the time it would take to make the same trip at 8 km/h. We can rearrange the formula to solve for time:

Time = Distance / Speed

Substituting the values, we have:

Time = 24 km / 8 km/h = 3 hours

Therefore, it would take 3 hours to make the same trip from city A to city B at a speed of 8 km/h.

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Note the translated question is A cyclist who goes at a constant speed of 12 km/h takes 2 hours to travel from city A to city B, how many hours would it take to make the same trip at 8 km/h?

Wronskian of the differential equation is [tex]t^{2}y''-t(t-4)y'+(t-5)y=0[/tex] .

The wronskian is an easy-to-use technique for obtaining conclusive, succinct information on the solutions of differential equations.

Given differential equation:

[tex]t^{2}y''-t\times (t-4)y'+(t-5)\times y=0[/tex]

divide both the sides by [tex]t^2[/tex] to get the standard form of given differential equation . Hence, the standard form is,

[tex]y''-\dfrac{t\times(t-4)}{t^2}y'+\dfrac{(t-2)}{t^2}y=0[/tex]

Now let,

[tex]p(t)=-\dfrac{t\times(t-4)}{t^2}[/tex]

On simplifying the above expression of [tex]p(t)[/tex] we get,

[tex]p(t)=-\dfrac{(t-4)}{t}[/tex]

         [tex]= -1 + \dfrac{4}{t}[/tex]     consider it as equation (1)

Let's calculate the Wronskian of the equation:

Wronskian of the given equation is defined as

[tex]W(t) = C e^{-\int p(t)dt}[/tex]

Substitute the value of [tex]p(t)[/tex]  obtained from equation (1)

[tex]W(t) = C e^{-\int (-1+\frac{4}{t})dt[/tex]

Since  [tex]\int 1dt =t[/tex] and [tex]\int \frac{1}{t}dt =ln t[/tex],

        [tex]=Ce^{t-4 ln t}[/tex]

        [tex]=Ce^{t}.e^{ln t^-4}[/tex]

        [tex]=Ce^{t}.t^{-4}[/tex]

Or we can write as :

[tex]W(t)= \frac{C}{t^4}e^{t}[/tex]

Therefore, The wronskian of the given differential equation is given as :

[tex]W(t)= \frac{C}{t^4}e^{t}[/tex]

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The polynomial have the following degrees and numbers of terms:

Case 1: Degree: 5, Number of terms: 4, Case 2: Degree: 3, Number of terms: 4, Case 3: Degree: 2, Number of terms: 2, Case 4: Degree: 5, Number of terms: 2, Case 5: Degree: 2, Number of terms: 3, Case 6: Degree: 2, Number of terms: 1

In this question we need to determine the degree and number of terms of each of the five polynomials. The degree of the polynomial is the highest degree of the monomial within the polynomial and the number of terms is the number of monomials comprised by the polynomial.

Now we proceed to determine all features for each case:

Case 1: Degree: 5, Number of terms: 4

Case 2: Degree: 3, Number of terms: 4

Case 3: Degree: 2, Number of terms: 2

Case 4: Degree: 5, Number of terms: 2

Case 5: Degree: 2, Number of terms: 3

Case 6: Degree: 2, Number of terms: 1

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A company has a revenue function R(x) = -4x²+10x and a cost function c(x) = 8.12x-10.8. To determine whether the company can break even, we need to find the value(s) of x where the revenue is equal to the cost. Hence after calculating we came to find out that the company can break even in two ways: when x is approximately -1.42375 or 1.89375.

To break even means that the company's revenue is equal to its cost, so we set R(x) equal to c(x) and solve for x:

-4x²+10x = 8.12x-10.8

We can start by simplifying the equation:

-4x² + 10x - 8.12x = -10.8

Combining like terms:

-4x² + 1.88x = -10.8

Next, we move all terms to one side of the equation to form a quadratic equation:

-4x² + 1.88x + 10.8 = 0

To solve this quadratic equation, we can use the quadratic formula:

x = (-b ± √(b²-4ac)) / (2a)

For our equation, a = -4, b = 1.88, and c = 10.8.

Plugging these values into the quadratic formula:

x = (-1.88 ± √(1.88² - 4(-4)(10.8))) / (2(-4))

Simplifying further:

x = (-1.88 ± √(3.5344 + 172.8)) / (-8)

x = (-1.88 ± √176.3344) / (-8)

x = (-1.88 ± 13.27) / (-8)

Now we have two possible values for x:

x₁ = (-1.88 + 13.27) / (-8) = 11.39 / (-8) = -1.42375

x₂ = (-1.88 - 13.27) / (-8) = -15.15 / (-8) = 1.89375

Therefore, the company can break even in two ways: when x is approximately -1.42375 or 1.89375.

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Based on the information provided, it can be concluded the RRIF would last 39 months.

First, calculate the interest rate. Since the annual interest rate is 10%, the quarterly interest rate is (10% / 4) = 2.5%.

Then, calculate the future value (FV) using the formula = FV = PV * [tex](1+r) ^{n}[/tex]

FV = $21,000 *  [tex](1+0.025)^{32}[/tex]

FV ≈ $48,262.17

After this, we can calculate the number of periods:

Number of periods = FV / Withdrawal amount

Number of periods = $48,262.17 / $3,485

Number of periods = 13.85, which can be rounded to 13 periods

Finally, let's calculate the duration:

Duration = Number of periods * 3

Duration = 13 * 3

Duration = 39 months

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The equation for the first situation was derived using the standard form of a sine function, while the equation for the second situation was derived by changing the frequency of the sine curve to fit the radius of the circle.

a) When you stand next to the merry-go-round that your friend is riding, the shape of the sine curve models the distance from you and your friend because you and your friend are rotating around a fixed point, which is the center of the merry-go-round.

The movement follows the shape of a sine curve because the distance between you and your friend keeps changing. At some points, you two will be at maximum distance, and at other points, you will be closest to each other. The distance varies sinusoidally over time, so a sine curve models the distance.

b) When you stand 4m away from the merry-go-round, the shape of the sine curve models the distance from you and your friend. You and your friend will be moving in a circle around the center of the merry-go-round.

The sine curve models the distance because the height of the curve will give you the distance from the center of the merry-go-round, which is 4m, to where your friend is.The distance varies sinusoidally over time, so a sine curve models the distance.

c) Two equations that will model these situations are given below:i) When you stand next to the merry-go-round; y = 4 sin (πx/4) + 4 ii) When you stand 4m away from the merry-go-round; y = 4 sin (πx/2)where, Amplitude = 4, Period = 8, Axis of the curve = 4, Maximum value = 8, Minimum value = 0, Intercept = 0.

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It will take approximately 35 days before 1000 people are infected.

Initially, 100 people were diagnosed with the virus.

A virus is spreading at a rate of 4% each day.

Let us calculate how many days it will take for 1000 people to be infected.

Let us assume that x represents the number of days it will take for 1000 people to be infected.

Since the number of people infected increases by 4% each day, after one day, the number of people infected will be 100 × (1 + 0.04) = 104 people.

After two days, the number of people infected will be 104 × (1 + 0.04) = 108.16 people

.After three days, the number of people infected will be 108.16 × (1 + 0.04) = 112.4864 people.

Thus, we can say that the number of people infected after x days is given by 100 × (1 + 0.04)ⁿ.

So, we can write 1000 = 100 × (1 + 0.04)ⁿ.

In order to solve for n, we need to isolate it.

Let us divide both sides by 100.

So, we have:10 = (1 + 0.04)ⁿ

We can then take the logarithm of both sides and solve for n.

Thus, we have:

log 10 = n log (1 + 0.04)

Let us divide both sides by log (1 + 0.04).

Therefore:

n = log 10 / log (1 + 0.04)

Using a calculator, we get:

n = 35.33 days

Rounding this off, we get that it will take about 35 days for 1000 people to be infected.

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Answer:

The sum of the first eight terms in the series is D. 195,312

Step-by-step explanation:

Given: 2+10+50+250....

we can transform this equation into:

[tex]2+2*5+2*5^2+2*5^3....[/tex] upto 8 terms

Taking 2 common

[tex]2*(1+5+5^2....)[/tex]

Let [tex]x = 1+5+5^2..... (i)[/tex] upto 8 terms.

Now, we have to compute [tex]2*x[/tex]

Let, [tex]y = 2*x[/tex]

Apply the formula for the sum of the series of Geometric Progression

Sum of Geometric Progression:

For r>1:

[tex]a+a*r+a*r^2+....[/tex] upto n terms

[tex]a*(1+r+r^2...)[/tex]

[tex]\frac{a*(r^n-1)}{r-1}....(ii)[/tex]

Where a is the first term, r is the common ratio and n is the number of terms.

Here, in equation (i),

[tex]a = 1\\r = 5\\n = 8[/tex]

Here, As r>1,

Applying a,r,n in equation (ii)

[tex]x = 1+5+5^2...5^7\\x = \frac{1(5^8-1)}{5-1}\\ x = 390624/4\\x = 97656[/tex]

Therefore,

[tex]1+5+5^2....5^7 = 97656[/tex]

Finally,

[tex]y = 2*x\\y = 2*97656\\y = 195312\\[/tex]

The sum of the first eight terms in the series is D. 195,312

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The sum of the first eight terms in the given series is 195,312. Therefore, Option D is the correct answer.

Given series- 2+10+50+250+...

We can see clearly that the series is a geometric series with-

First term (a)= 2

Common ratio (r) = 5

To find the sum of the first eight terms, we can use the formula for the sum of a geometric series:

[tex]S_{n}=\fraca{(1-r^{n})}/{(1-r)}[/tex], [tex]r\neq 1[/tex]

Substituting the values;

[tex]Sum = (2 * (1 - 5^8)) / (1 - 5)[/tex]

Simplifying further;

[tex]Sum = (2 * (1 - 390625)) / (-4)[/tex]

Sum = [tex]\frac{-781248}{-4}[/tex]

Sum=195312

Therefore, the sum of the first eight terms in the series is 195312.

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The answer is that none of Walter's social security benefits will most likely be considered taxable income.

Walter, a 68-year-old single taxpayer, received $18,000 in social security benefits in 2021. He also earned $14,000 in wages and $4,000 in interest income, $2,000 of which was tax-exempt. To determine the percentage of Walter's benefits that will most likely be considered taxable income, we need to calculate his combined income.

Walter's total income is the sum of his social security benefits, wages, and interest income:

Total income = $18,000 + $14,000 + $4,000 = $36,000

However, we need to subtract the tax-exempt interest from his total income:

Total income - Tax-exempt interest = $36,000 - $2,000 = $34,000

To calculate the taxable part of Walter's social security benefits, we take half of his social security benefits and add it to his total income:

Taxable part = (Half of social security benefits) + Total income

Taxable part = ($18,000 ÷ 2) + $34,000

Taxable part = $9,000 + $34,000 = $43,000

Since Walter's combined income is less than $34,000, none of his benefits will be considered taxable income. Therefore, the answer is that none of Walter's social security benefits will most likely be considered taxable income.

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Answer:

2,1

Step-by-step explanation:

The exact value of cos(90°) using a half-angle identity, is 0.

The half-angle formula states that cos(θ/2) = ±√((1 + cosθ) / 2). By substituting θ = 180° into the half-angle formula, we can determine the exact value of cos(90°).

To find the exact value of cos(90°) using a half-angle identity, we can use the half-angle formula for cosine, which is cos(θ/2) = ±√((1 + cosθ) / 2).

Substituting θ = 180° into the half-angle formula, we have cos(90°) = cos(180°/2) = cos(90°) = ±√((1 + cos(180°)) / 2).

The value of cos(180°) is -1, so we can simplify the expression to cos(90°) = ±√((1 - 1) / 2) = ±√(0 / 2) = ±√0 = 0.

Therefore, the exact value of cos(90°) is 0.

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(a) The number of ways to choose nine po-boys from twelve options is 220.

(b) The number of ways to choose 20 po-boys with at least one of each kind is 36,300.

The number of ways to choose po-boys can be found using combinations.

a) To determine the number of ways to choose nine po-boys, we can use the concept of combinations. In this case, we have twelve different types of po-boys to choose from. We want to choose nine po-boys, without any restrictions on repetition or order.

The formula to calculate combinations is given by C(n, r) = n! / (r!(n-r)!), where n is the total number of items and r is the number of items to be chosen.

Using this formula, we can calculate the number of ways to choose nine po-boys from twelve options:

C(12, 9) = 12! / (9!(12-9)!) = 12! / (9!3!) = (12 × 11 × 10) / (3 × 2 × 1) = 220.

Therefore, there are 220 ways to choose nine po-boys from the twelve available options.

b) To determine the number of ways to choose 20 po-boys with at least one of each kind, we can approach this problem using combinations as well.

We have twelve different types of po-boys to choose from, and we want to choose a total of twenty po-boys. To ensure that we have at least one of each kind, we can choose one of each kind first, and then choose the remaining po-boys from the remaining options.

Let's calculate the number of ways to choose the remaining 20-12 = 8 po-boys from the remaining options:

C(11, 8) = 11! / (8!(11-8)!) = 11! / (8!3!) = (11 × 10 × 9) / (3 × 2 × 1) = 165.

Therefore, there are 165 ways to choose the remaining eight po-boys from the eleven available options.

Since we chose one of each kind first, we need to multiply the number of ways to choose the remaining po-boys by the number of ways to choose one of each kind.

So the total number of ways to choose 20 po-boys with at least one of each kind is 220 × 165 = 36300.

Therefore, there are 36,300 ways to choose 20 po-boys with at least one of each kind.

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1. Homogeneous solution is [tex]\rm y_h(t) = c_1e^{(1/2t)} + c_2te^{(1/2t)[/tex].

2. Particular solution: [tex]\rm y_p(t) = 80e^{(1/2t)[/tex].

3. General solution: [tex]\rm y(t) = y_h(t) + y_p(t) = c_1e^{(1/2t)} + c_2te^{(1/2t)} + 80e^{(1/2t)[/tex].

1. Find the homogeneous solution:

The characteristic equation for the homogeneous equation is given by [tex]$4r^2 - 4r + 1 = 0$[/tex]. Solving this equation, we find that the roots are [tex]$r = \frac{1}{2}$[/tex] (double root).

Therefore, the homogeneous solution is [tex]$ \rm y_h(t) = c_1e^{\frac{1}{2}t} + c_2te^{\frac{1}{2}t}$[/tex], where [tex]$c_1$[/tex] and [tex]$c_2$[/tex] are constants.

2. Find the particular solution:

Assume the particular solution has the form [tex]$ \rm y_p(t) = u(t)e^{\frac{1}{2}t}$[/tex], where u(t) is a function to be determined. Differentiate [tex]$y_p(t)$[/tex] to find [tex]$y_p'$[/tex] and [tex]$y_p''$[/tex]:

[tex]$ \rm y_p' = u'e^{\frac{1}{2}t} + \frac{1}{2}ue^{\frac{1}{2}t}$[/tex]

[tex]$ \rm y_p'' = u''e^{\frac{1}{2}t} + u'e^{\frac{1}{2}t} + \frac{1}{4}ue^{\frac{1}{2}t}$[/tex]

Substitute these expressions into the differential equation [tex]$ \rm 4(y_p'') - 4(y_p') + y_p = 80e^{\frac{1}{2}}$[/tex]:

[tex]$ \rm 4(u''e^{\frac{1}{2}t} + u'e^{\frac{1}{2}t} + \frac{1}{4}ue^{\frac{1}{2}t}) - 4(u'e^{\frac{1}{2}t} + \frac{1}{2}ue^{\frac{1}{2}t}) + u(t)e^{\frac{1}{2}t} = 80e^{\frac{1}{2}}$[/tex]

Simplifying the equation:

[tex]$ \rm 4u''e^{\frac{1}{2}t} + u(t)e^{\frac{1}{2}t} = 80e^{\frac{1}{2}}$[/tex]

Divide through by [tex]$e^{\frac{1}{2}t}$[/tex]:

[tex]$4u'' + u = 80$[/tex]

3. Solve for u(t):

To solve for u(t), we assume a solution of the form u(t) = A, where A is a constant. Substitute this solution into the equation:

[tex]$4(0) + A = 80$[/tex]

[tex]$A = 80$[/tex]

Therefore, [tex]$u(t) = 80$[/tex].

4. Find the particular solution [tex]$y_p(t)$[/tex]:

Substitute [tex]$u(t) = 80$[/tex] back into [tex]$y_p(t) = u(t)e^{\frac{1}{2}t}$[/tex]:

[tex]$y_p(t) = 80e^{\frac{1}{2}t}$[/tex]

Therefore, a particular solution of the differential equation [tex]$4y'' - 4y' + y = 80e^{\frac{1}{2}}$[/tex] that does not involve any terms from the homogeneous solution is [tex]$y_p(t) = 80e^{\frac{1}{2}t}$[/tex].

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Answer:

SAS, because vertical angles are congruent.