The probability of the spinner landing on keychain is 1/4 or 0.25, which means that for every 4 spins, the spinner is expected to land on keychain once on average.
What is probability?The measure of the likelihood that an event will occur is known to be Probability.
This is a number between 0 and 1, where 0 represents an impossible event (has no chance of occurring) and 1 represents a definite event (100% chance of occurring).
An event with a probability of 0.5 is equally likely to occur and not to occur.
To find the probability of the spinner landing on keychain, we need to first determine the total number of spins and the number of times the spinner landed on keychain.
From the given data, we can see that the spinner was spun 8 times, and it landed on keychain twice. Therefore, the probability of the spinner landing on keychain is:
Probability of keychain = Number of times the spinner landed on keychain / Total number of spins
Probability of keychain = 2/8 = 1/4
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Find the Area of the figure below, composed of a rectangle with a semicircle removed from it. Round to the nearest tenths place.
Step-by-step explanation:
as the description says, the area is a rectangle (8×4) minus the half-circle at the right.
the radius of the (half-)circle is 4/2 = 2, as 4 is the diameter.
the area of the circle is
pi×r² = pi×2² = 4pi
the area of the half-circle is then
4pi/2 = 2pi
the area of the rectangle is
8×4 = 32
the total area is
32 - 2pi = 25.71681469... ≈ 25.7 square units
Answer:
25.7 square units
Step-by-step explanation:
You want the area of a 4 × 8 rectangle with a semicircle of diameter 4 removed from the end.
AreaThe area of the enclosing rectangle is ...
A = LW
A = (8)(4) = 32 . . . . . square units
The are of the missing semicircle is ...
A = 1/2πr² . . . . . . where r is half the diameter
A = 1/2π(4/2)² = 2π ≈ 6.3 . . . . . square units
Then the area of the figure is ...
A = rectangle - semicircle = 32 -6.3 = 25.7 . . . . . square units
The area of the figure is about 25.7 square units.
Find X in this equation: 5x^2-5x-30=0
x=? x=???
Answer:
x1 = -2;
x2 = 3
Step-by-step explanation:
[tex]5 {x}^{2} - 5x - 30 = 0[/tex]
Solve this quadratic equation (a = 5; b = -5; c = -30)
[tex]d = {b}^{2} - 4ac = ( { - 5})^{2} - 4 \times 5 \times ( - 30) = 25 + 600 = 625 > 0[/tex]
x1 = (-b - √d) / 2a = (5 - 25) / 2 × 5 = -20 / 10 = -2
[tex]x2 = \frac{ - b + \sqrt{d} }{2a} = \frac{5 + 25}{2 \times 5} = \frac{30}{10} = 3[/tex]
Properties of equality reference packet geometry
The properties used were the distributive property of multiplication over addition, the subtraction property of equality, and the multiplication property of equality.
What are properties?Properties are statements that are true for a wide range of numbers or equations. They are rules that describe the behavior of mathematical objects and relationships between them.
According to question:1) Given 4x-1=27, we can use the addition property of equality to add 1 to both sides:
4x-1+1 = 27+1
Simplifying, we get:
4x = 28
Then, we can use the multiplication property of equality to divide both sides by 4:
4x/4 = 28/4
Simplifying, we get:
x = 7
Therefore, we have proved that if 4x-1=27, then x=7.
The properties used were the addition property of equality and the multiplication property of equality.
2) Given (a/(-6))+2=5, we can use the subtraction property of equality to subtract 2 from both sides:
(a/(-6))+2-2 = 5-2
Simplifying, we get:
a/(-6) = 3
Then, we can use the multiplication property of equality to multiply both sides by -6:
(a/(-6))(-6) = 3(-6)
Simplifying, we get:
a = -18
Therefore, we have proved that if (a/(-6))+2=5, then a=-18.
3) The properties used were the subtraction property of equality and the multiplication property of equality.
Given -9(2x-3)=63, we can use the distributive property of multiplication over addition to simplify the left-hand side:
-9(2x-3) = -18x + 27
Then, we can use the subtraction property of equality to subtract 27 from both sides:
-18x + 27 - 27 = 63 - 27
Simplifying, we get:
-18x = 36
Finally, we can use the multiplication property of equality to divide both sides by -18:
(-18x)/(-18) = 36/(-18)
Simplifying, we get:
x = -2
Therefore, we have proved that if -9(2x-3)=63, then x=-2.
The properties used were the distributive property of multiplication over addition, the subtraction property of equality, and the multiplication property of equality.
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1+20
i dont knwo what it it
Answer:
21
Step-by-step explanation:
20+1=21
a bottle of soap cost 3.45 for 15 ounces. what is the cost per ounce?
Answer:
Step-by-step explanation:
15 divided by 15 is 1
3.45 divided by 15 is 0.23
The cost per ounce is 23 cents, or $0.23
Lillian owns a small business selling ice-cream. She knows that in the last week 12 customers paid cash, 28 customers used a debit card, and 42 customers used a credit card. Based on these results, express the probability that the next customer will pay with something other than a debit card as a fraction in simplest form.
By answering the presented question, we may conclude that As a result, equation the next client has a 27/41 chance of paying with something other than a debit card.
What is equation?An equation in mathematics is a statement that states the equality of two expressions. An equation is made up of two sides that are separated by an algebraic equation (=). For example, the argument "2x + 3 = 9" asserts that the phrase "2x Plus 3" equals the number "9." The purpose of equation solving is to determine the value or values of the variable(s) that will allow the equation to be true. Equations can be simple or complicated, regular or nonlinear, and include one or more elements. The variable x is raised to the second power in the equation "x2 + 2x - 3 = 0." Lines are utilized in many different areas of mathematics, such as algebra, calculus, and geometry.
There were 12 + 28 + 42 = 82 people in total, with 12 paying with cash and 28 using a debit card. As a result, the number of consumers who did not use a debit card is 82 - 28 = 54.
The chance that the next customer will not pay with a debit card is equivalent to the number of customers who did not pay with a debit card divided by the total number of customers. As a result, the likelihood is:
54/82
This fraction can be simplified by splitting the numerator and denominator by their largest common factor, which is 2:
54/82 = (2 × 27)/(2 × 41) = 27/41
As a result, the next client has a 27/41 chance of paying with something other than a debit card.
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For the situation is below, define a random variable X for the situation, and then decide if they follow a binomial distribution model by commenting on the floor requirements.
1. You roll a DnD (20-sided), 20 times and record the number that shows on the dice.
After answering the presented question, we can conclude that The equation number of trials is predetermined: We're going to roll the dice 20 times.
What is equation?An equation is a statement in mathematics that shows that two expressions are equal. It consists of two sides separated by an equal sign (=). For example, 2 + 3 = 5 is an equation because the expression on the left-hand side (2 + 3) is equal to the expression on the right-hand side (5).
Equations are used in many areas of mathematics, science, and engineering to describe relationships between quantities and to solve problems. For example, equations are used to model physical phenomena, such as the motion of objects, the behavior of fluids, and the propagation of waves. They are also used in finance, statistics, and many other fields to analyze data and make predictions.
In this case, the random variable X reflects the number of times a specific number appears after rolling a 20-sided die 20 times.
To see if this situation fits the binomial distribution model, we must look at the four conditions listed below:
The trials are impartial: Each throw of the dice is distinct from the others.
There are just two possibilities: Each roll can produce one of the 20 numbers or none at all.
The likelihood of success is constant: The probability of rolling a given number on a 20-sided dice is the same for each roll.
The number of trials is predetermined: We're going to roll the dice 20 times.
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The path of the basketball is modeled by the equation h() = −.25 + 2 + 4 where t is the time in seconds and h(t) is the height of the basketball at time t. What type of vertex (minimum or maximum) would this quadratic function create? Explain, using any method, how you found your answer.
To determine the type of vertex created by this quadratic function, we need to find the vertex of the parabola. The vertex of a parabola is the point where the parabola reaches its minimum or maximum value.
What is the vertex of a quadratic function?The given equation [tex]h(t) = -0.25t^2 + 2t + 4[/tex] represents the height of the basketball as a function of time.
The vertex of a quadratic function in the form of [tex]f(x) = ax^2 + bx + c[/tex] can be found by using the formula:
[tex]x = -b/2a[/tex]
[tex]y = f(x) = a(x^2) + bx + c[/tex]
where (x,y) is the vertex of the parabola.
Comparing this with the given equation [tex]h(t) = -0.25t^2 + 2t + 4[/tex] , we see that a = -0.25, b = 2, and c = 4.
Substituting these values in the formula, we get:
[tex]t = -2/(2\times(-0.25)) = 4[/tex]
[tex]h(4) = -0.25(4)^2 + 2(4) + 4 = 6[/tex]
Therefore, the vertex of the parabola is [tex](4, 6)[/tex] . Since the coefficient of the t^2 term is negative, the parabola opens downwards, and the vertex represents the maximum point of the parabola. The quadratic function [tex]h(t) = -0.25t^2 + 2t + 4[/tex] would create a maximum vertex.
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The monthly expenses of a business can be modeled by y 2.75x + 7.5 The revenue generated by the business can be represented by the function y = 0.2x ^ 2 + 1.5x In each function, x is the number of months since the business opened and y is the amount of money in thousands of dollars. After how many months will the revenue earned be equal to the business's expenses.
Thus, the number of months when the revenue earned will be equal to the business's expenses is 8 months approx)
Explain about the quadratic function;f(x) = ax² + bx + c, from which a, b, and c are numbers and an is not equal to zero, is a quadratic function. A parabola is the shape of a quadratic function's graph. Even though "width" or "steepness" of a parabola can vary as well as its path of opening, they all share so same fundamental "U" form.
Given data:
monthly expenses's function: y = 2.75x + 7.5 .
revenue function: y = 0.2x² + 1.5x
x is the number of months
y is the amount of money (dollars)
monthly expenses = revenue function
2.75x + 7.5 = 0.2x² + 1.5x
On simplification:
0.2x² + 1.5x - 2.75x - 7.5 = 0
0.2x² - 1.25x - 7.5 = 0
Divide equation by 0.2
x² - 6.25x - 37.5 = 0
standard form of quadratic eq: ax² + bx + c = 0
On comparing:
a = 1, b = -6.25 and c = -7.5
Using the quadratic formula:
x = [tex](-b + \sqrt{b^{2} - 4 ac } )/ 2a[/tex] and x = [tex](-b - \sqrt{b^{2} - 4 ac } )/ 2a[/tex]
Put the values:
x = [tex](6.25 + \sqrt{-6.25^{2} - 4 *1*(-7.5) } )/ 2*1[/tex]
x = (6.25 + 8.31)/2
x = 7.28 (number of months)
x = 8 months approx
and x = [tex](6.25 - \sqrt{-6.25^{2} - 4 *1*(-7.5) } )/ 2*1[/tex]
x = (6.25 - 8.31)/2
x = -1.03 (negative value not taken)
Thus, the number of months when the revenue earned will be equal to the business's expenses is 8 months approx)
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complete question:
The monthly expenses of a business can be modeled by y = 2.75x + 7.5 The revenue generated by the business can be represented by the function y = 0.2x² + 1.5x. In each function, x is the number of months since the business opened and y is the amount of money in thousands of dollars. After how many months will the revenue earned be equal to the business's expenses.
Which graph represents the function f (x) = 3 +4?
The graph that closely matches the function is graph C.
George placed a compass on the vertices of the triangle and drew intersecting arcs to find points W, X, Y, and Z as shown. He is going to draw lines through the arcs and find their point of intersection.
The figure shows the triangle JKL in which JK is the perpendicular bisector of JL and WX is the perpendicular bisector of YZ.
What is George trying to find?
A.
one of the three different points that are equidistant from the three sides of the triangle
B.
one of the three different points that are equidistant from the three vertices of the triangle
C.
the only point that is equidistant from the three sides of the triangle
D.
the only point that is equidistant from the three vertices of the triangle
The answer of the given question based on the triangle is, option (A) one of the three different points that are equidistant from the three sides of the triangle.
What is Point of intersection?A point of intersection is a point where two or more lines, curves, or surfaces meet or cross each other. In geometry, the point of intersection can be used to find important properties of the objects involved, such as angles, distances, and coordinates.
George is trying to find point that is equidistant from three sides of the triangle.
The point of intersection of the lines passing through the arcs drawn from the vertices of the triangle using a compass is called the circumcenter of the triangle. The circumcenter is equidistant from three vertices of triangle, which means that it lies on perpendicular bisectors of three sides of triangle.
In this case, the perpendicular bisectors of JL and YZ are shown as lines JK and WX respectively. The circumcenter of triangle JKL is the point where these two lines intersect. This point is equidistant from the sides KL, LJ, and JK of the triangle.
Therefore, the answer is (A) one of the three different points that are equidistant from the three sides of the triangle.
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The answer is B. George is trying to find one of the three different points that are equidistant from the three vertices of the triangle.
Define the term Point of intersection?The intersection of two or more lines, curves, or surfaces is known as a point of intersection.
George is trying to find one of the three different points that are equidistant from the three vertices of the triangle JKL.
The intersection of the arcs drawn from the vertices of the triangle will be equidistant from those vertices. This point is called the circumcenter of the triangle, and it is the center of the circumcircle that passes through all three vertices of the triangle.
Since George is drawing lines through the arcs and finding their point of intersection, he is finding the circumcenter of the triangle. The circumcenter is one of the three different points that are equidistant from the three vertices of the triangle.
Therefore, the answer is B. George is trying to find one of the three different points that are equidistant from the three vertices of the triangle.
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Please lmk asap, I’m so lost.
The complete table is:
x f(x)
-8 -8
-1 -8
1 -8
And the graph can be seen in the image at the end.
How to complete the table?Here we have the function:
f(x) = -8
This is a constant function, for every input that we use, the output will be the same one, then:
f(-8) = -8
f(-1) = -8
f(1) = -8
Then the complete table is:
x f(x)
-8 -8
-1 -8
1 -8
And the graph of these 3 points can be seen in the image at the end.
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what is the value of the expression 2x^2-5xy when x =-3 and y=8?
Answer:
156
Step-by-step explanation:
The value of the expression 2x^2 - 5xy when x = -3 and y = 8 is 138.
Explanation:To find the value of the expression, 2x^2 - 5xy, when x = -3 and y = 8, we just need to substitute the given values into the expression.
So, 2x^2 - 5xy becomes 2*(-3)^2 - 5*(-3)*8 = 2*9 + 15*8 = 18 + 120 = 138
Therefore, the value of the expression 2x^2 - 5xy when x = -3 and y = 8 is 138.
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A seagull is 23 meters above the surface of the ocean. What is its elevation?
Answer: 23 meter
Step-by-step explanation:
meters "above"
elevation means the distance above sea level
In the graph shown below, what is f(2)?
A. f(2) = 2
B. f(2) = 1
C. f(2) -1 and f(2) = 2
D. f(2) doesn't exist
Tyler’s fish tank has 12 orange fish and 4 grey fish. What is the ratio of orange fish to Grey fish
Answer:
12:4
=3:1 (Simplified )
amelia started with $54, and spent $6 each day at camp. she has $18 left.write and solve an equation that can be used to find in how many days, d she has left at camp.which equation can be used to determine how many days d she was at camp?
Amelia was at camp for 6 days. The equation used to determine how many days(D) she was at camp is C x D = 6D and S - (C x D) = E
Given data:
S = initial amount = $54
D = the number of days
C = the cost per day = $6
E: the ending amount = $18
Amelia started with S=$54 and spent C=$6 each day at camp.
Therefore, the total amount she spent at camp is given in an algebraic expression that states the product of two variables:
C x D = 6D
Next, she ended with E=$18. So, the equation can be written in algebraic expression that states the difference between the variable:
S - (C x D) = E
Substituting the values in the equation we get:
54 - 6D = 18
54 - 18 = 6D
36 = 6D
D = 6
Therefore, Amelia was at camp for 6 days.
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Which represents an exterior anglA triangle is sitting on a horizontal line. The bottom left interior angle of the triangle is (9 + k) degrees. The exterior angle to the bottom left interior angle is (5 k minus 3) degrees.
What is the value of k?
e of triangle ABF?
The value of k is approximately 10.33.
What is the exterior angle?
An exterior angle is an angle that forms a linear pair with an interior angle of a polygon. It is formed by extending one of the sides of the polygon. In other words, it is the angle formed between a side of a polygon and the extension of an adjacent side.
In a triangle, the measure of an exterior angle is equal to the sum of the measures of its two remote interior angles. In this problem, the exterior angle to the bottom left interior angle is (5k - 3) degrees, and the corresponding remote interior angle is (9 + k) degrees. Therefore, we can write:
(5k - 3) = (9 + k) + x
where x is the other remote interior angle of the triangle.
Simplifying this equation, we get:
5k - 3 = 9 + k + x
4k = 12 + x
x = 4k - 12
Now, we know that the sum of the interior angles of a triangle is 180 degrees. So, we can write:
(9 + k) + (5k - 3) + x = 180
Substituting x with 4k - 12, we get:
(9 + k) + (5k - 3) + (4k - 12) = 180
Simplifying this equation, we get:
18k - 6 = 180
18k = 186
k = 10.33 (rounded to two decimal places)
Therefore, the value of k is approximately 10.33.
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What is the equation of a line parallel to y=-5x+3 that passes through (3,7)
Maceeey's family wants to buy a new desktop computer. The sides of the screen are 20 inches by 24 inches. What is the diagonal of the screen?
The radius of container M is 3 inches and the height is 9.5 inches. A cook has
several boxes of sugar that are each the same size and volume. The cook empties 1
box of sugar into container M. He then empties of another box of sugar into
container M to completely fill it. What is the approximate volume, in cubic Inches, of
1 box of sugar?
The volume of container M can be calculated using the formula for the volume of a cylinder:
V = πr^2h
where V is the volume, r is the radius, and h is the height.
Substituting the given values, we have:
V = π(3 in)^2(9.5 in)
V ≈ 254.47 cubic inches
Let x be the volume of one box of sugar. According to the problem, the cook emptied one box of sugar into the container, and then added some fraction of another box to completely fill it. This means that the total volume of sugar added is equal to 1 + some fraction of x.
We can set up an equation to solve for x:
1 + (1/n)x = 254.47
where n is the fraction of the second box of sugar added.
Solving for x, we get:
x = (254.47 - 1) n
x = 253.47n
To find the value of n, we can subtract 1 box of sugar from the total volume added, and then divide by the volume of one box:
n = (254.47 - 1) / x
n = 253.47 / x
Substituting the expression for x from above, we get:
n = 253.47 / (253.47n)
n^2 = 253.47 / 1
n ≈ 15.93
Therefore, the volume of one box of sugar is approximately:
x ≈ 253.47 / 15.93
x ≈ 15.91 cubic inches
a scientist has two solutions, which she has labeled solution a and solution b. each contains salt. she knows that solution a is 35% salt and solution b is 85% salt. she wants to obtain 150 ounces of a mixture that is 40% salt. how many ounces of each solution should she use?
Answer:
To solve this problem, we can use a system of equations. Let x be the number of ounces of solution A and y be the number of ounces of solution B. Then we have: x + y = 150 (total solution) 0.35x + 0.85y = 0.4(150) (total salt) Simplifying the second equation, we get: 0.35x + 0.85y = 60 Multiplying both sides of the first equation by 0.35 and subtracting from the second equation, we get: 0.5y = 15 y = 30 Substituting y = 30 into the first equation, we get: x + 30 = 150 x = 120 Therefore, the scientist should use 120 ounces of solution A and 30 ounces of solution B to obtain
The scientist should use 135 ounces of solution a and 15 ounces of solution b to obtain 150 ounces of a mixture that is 40% salt. This can be answered by the concept of system of equations.
To solve this problem, we can use a system of equations. Let x be the number of ounces of solution a used, and y be the number of ounces of solution b used. We want to find x and y such that:
x + y = 150 (we need 150 ounces of the mixture)
0.35x + 0.85y = 0.4(150) (the total amount of salt in the mixture should be 40% of 150 ounces)
We can solve this system of equations by first multiplying the second equation by 100 to get rid of the decimals:
35x + 85y = 6000
Then we can use the first equation to solve for one variable in terms of the other:
y = 150 - x
Substituting this into the second equation, we get:
35x + 85(150 - x) = 6000
35x + 12750 - 85x = 6000
-50x = -6750
x = 135
Therefore, the scientist should use 135 ounces of solution a and 15 ounces of solution b.
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a survey revealed that 21.5% of the households had no checking account, 66.9% had regular checking accounts, and 11.6% had now accounts. of those households with no checking account 40% had savings accounts. of the households with regular checking accounts 71.6% had a savings account. of the households with now accounts 79.3% had savings accounts. the probability that a randomly selected household has a savings account is:
The probability that a randomly selected household has a savings account is 57.16%. therefore, correct option is (C) 57.16%.
Given,
A survey revealed that 21.5% of the households had no checking account.
Of those households with no checking account, 40% had savings accounts.= 21.5% × 40%= 0.086%66.9%
had regular checking accounts. Of the households with regular checking accounts,
71.6% had a savings account.= 66.9% × 71.6%= 47.8916%11.6% had now accounts.
Of the households with now accounts,
79.3% had savings accounts.= 11.6% × 79.3%= 9.1828%
Therefore, the probability that a randomly selected household has a savings account is:
0.086 + 47.8916 + 9.1828 = 57.16%
So, the correct option is (C) 57.16%.
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i need to identify the value of x that makes each pair of ratios equivalent
1. 2:x and 12:18
2. 5:15 and x:3
3. x:4 and 45:20
4. 21 to x and 7 to 10
5. x to 50 and 16 to 25
6. 6 to 8 and 18 to x
7. 9/36 and x/4
8. 42/22 and 21/x
9. x/7 and 5/1
10. 20/x 4/8
i cant even understand the subject its too hard for me
Answer:
lbozo
Step-by-step explanation:
Please help quickkkkkkk
2(6×7) + 2(3×7) + 2(3×6)
= 162
the weekly sales at two movie theaters were recorded for a random sample of 25 weeks. a 95 percent confidence interval for the difference in mean weekly sales for the two movie theaters was calculated as
To calculate the 95% confidence interval for the difference in mean weekly sales for the two movie theaters, follow these steps:
Step 1: Gather the data for the random sample of 25 weeks.
Step 2: Calculate the mean and standard deviation for each movie theater's weekly sales.
Step 3: Calculate the difference in mean weekly sales for the two movie theaters (subtract the mean of theater 2 from the mean of theater 1).
Step 4: Calculate the standard error of the difference by taking the square root of [(standard deviation of theater 1^2 / number of weeks) + (standard deviation of theater 2^2 / number of weeks)].
Step 5: Determine the critical value for a 95% confidence interval using a t-table or calculator (for a two-tailed test with 24 degrees of freedom, the critical value is approximately 2.064).
Step 6: Multiply the critical value by the standard error to get the margin of error.
Step 7: Calculate the lower and upper bounds of the confidence interval by subtracting and adding the margin of error from the difference in mean weekly sales.
The result will be the 95% confidence interval for the difference in mean weekly sales for the two movie theaters.
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Mr. Sonny's science class is calculating the average number of blinks per minute. Jan blinks 100 times in 5 minutes. What is her blinking rate, in blinks per minute?
QUICK! I need help with this one please
The first term of the polynomial in standard form must be 4y⁴
If Julian wrote the last term as -3x⁴, the terms with the highest degree must have a coefficient of 3.
To get the standard form, we need to combine like terms and arrange the terms in descending order of degree.
The polynomial can be simplified as follows:
4x²y²-2y⁴-8xy³+9x³y+6y⁴-2xy³-3x⁴+x²y²
= -3x⁴ + (4x²y² + x²y²) + (-2y⁴ + 6y⁴) + (-8xy³ - 2xy³) + 9x³y
= -3x⁴ + 5x²y² + 4y⁴ - 10xy³ + 9x³y
Therefore, the standard form of the polynomial is
-3x⁴ + 5x²y² + 4y⁴ - 10xy³ + 9x³y
= 4y⁴ + 5x²y² + -3x⁴ - 10xy³ + 9x³y
The term with the highest degree is -3x⁴, and the terms are arranged in descending order of degree. The answer is not one of the options given.
Therefore, the first term of the polynomial in standard form must be 4y⁴.
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For the following image, find x :
x =
Answer:
x = 11
Step-by-step explanation:
[tex] \frac{8}{48} = \frac{x}{x + 55} [/tex]
[tex]8(x + 55) = 48x[/tex]
[tex]8x + 440 = 48x[/tex]
[tex]40x = 440[/tex]
[tex]x = 11[/tex]
In the diagram below, find the indicated segment length. Assume that lines or segments which appear to be tangent are tangent.
Step-by-step explanation:
16 is tangent and the radial (12) is perpendicular
so this is a right triangle
Use Pythagorean theorem
?^2 = 12^2 + 16^2
?^2 = 400
? = 20 units