(1/x-y)-(2/2x+y)+(1/x+y)-(2/2x-y)​

The number οf hοurs fοr Shandra wοrking tο wash car is 2 hοurs.

The number οf hοurs fοr Shandra wοrking tο walking dοgs is 9 hοurs.

Mathematical expressiοn is defined as the cοllectiοn οf the numbers variables and functiοns by using οperatiοns like additiοn, subtractiοn, multiplicatiοn, and divisiοn.

Given that;

Shandra is wοrking twο summer jοbs, making $9 per hοur washing cars and $8 per hοur walking dοgs.

Last week Shandra wοrked a tοtal οf 11 hοurs.

Tοtal earned = $90

Nοw,

Tοtal number οf hοurs tο wash car = x

Tοtal number οf hοurs tο walk dοgs = y

Sο, We can fοrmulate;

⇒ 9x + 8y = $90  ... (I)

And, x + y = 11   .. (ii)

Sοlve equatiοn (i) and (ii) we get;

x = 2 hοurs and y = 9 hοurs

Sο, The number οf hοurs fοr Shandra wοrking tο wash car is 2 hοurs.

The number οf hοurs fοr Shandra wοrking tο walking dοgs is 9 hοurs.

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The formula you need to use in order to find the volume of a cylinder is [tex]V = \pi r^{2} h[/tex]

Step 1) Take note of the information that has been provided to you.

The height is 8 yards

The radius is 2 years

Step 2) Substitute the information above into the formula.

[tex]V = \pi (2^{2})(8)[/tex]

Step 3) Solve.

[tex]V = \pi (2^{2})(8)[/tex]  [tex]=100.53[/tex]

Step 4) Round if necessary.

[tex]100.53 = 101[/tex]

Answer:

Step-by-step explanation:

What is a rectangular prism?

A right rectangular prism is a box-shaped object, that is, a 3-dimensional solid which has six rectangular faces. Rectangular prisms can also be oblique - leaning to one side - but the side faces are parallelograms, not rectangles. A right rectangular prism is also called a cuboid, box, or rectangular hexahedron. Moreover, "rectangular prism" and "right rectangular prism" are often used interchangeably.

The most common math problems related to this solid are of the type right rectangular prism calc find V or find A, where the letters stand for the Volume and Area, respectively. Let's see the necessary rectangular prism formula and learn how to solve those problems quickly and easily.

How do I find the volume of a rectangular prism?

The rectangular prism volume formula is:

volume = h × w × l,

where h is prism height, w is its width, and l is its length. To calculate the volume of a cardboard box:

Find the box length. For example, it can be equal to 18 in.

Determine its width. Let's say you measured 12 in.

Find out the rectangular prism height. Assume it's 15 in.

Calculate the cuboid volume. Using the rectangular prism volume formula above, we get volume = (18 × 12 × 15) in = 3240 in³.

How do I find the area of a rectangular prism?

The surface area of the cuboid consists of 6 faces - three pairs of parallel rectangles. To find the rectangular prism surface area, add the areas of all faces:

surface_area = 2 × (h × w) + 2 × (h × l) + 2 × (l × w) = 2 × (h × w + h × l + l × w),

where h is prism height, w is its width, and l is its length.

Let's see an example of how to solve the right rectangular prism calc - find A problem. We'll come back to our example with the box and calculate its surface area:

Calculate the rectangular prism surface area. First rectangle area is 15in × 12in = 180in², second 15in × 18in = 270in² and third one 18in × 12in = 216in². Add all three rectangles' areas - it's equal to 666 in² (what a number!) - and finally multiply by 2. The surface area of our cardboard box is 1332in².

Or save yourself some time and use our rectangular prism calculator.

Finally, let's attack the right rectangular prism calc find d (that is, the diagonal) type of problem.

How do I calculate the diagonal of a rectangular prism?

To determine the diagonal of a rectangular prism, apply the formula:

diagonal = √(l² + h² + w²)

where h is prism height, w is its width, and l is its length.

Do you have the feeling that you saw the formula before? Yes, that's possible because this equation resembles the famous one from the Pythagorean theorem.

A 14.2 million donation was made to a charity. The overall amount of the charity's contributed funds is 34 million if which amounts to 42% of those monies.

Let x represent the total amount of donations received by the charity.

According to the problem, 14.2 million represents 42% of the charity's donated funds:

14.2 million = 0.42x

We must isolate x on one side of the equation in order to find it. We can do this by dividing both sides of the equation by 0.42:

x = 14.2 million / 0.42

x = 33.80952381 million

Rounding this answer to the nearest million gives:

x ≈ 34 million

Therefore, the total amount of the charity's donated funds is approximately 34 million.

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The value of x for the intersecting chords is equal to 44°

The property of intersecting chords states that in a circle, if two chords intersect, the product of the lengths of the segments of one chord is equal to the product of the lengths of the segments of the other chord.

x = (124° - 36°)/2

x = 88°/2

x = 44°

Therefore, the value of x for the intersecting chords is equal to 44°.

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The inequality used is 20m ≥ 380 and Matthew needs to mow at least 19 lawns to make his goal of $380.

A mathematical comparison of two quantities using the symbols (less than), > (greater than), (less than or equal to), or is known as an inequality (greater than or equal to). Relationships between values that might not be equal, such the magnitude of two numbers or the range of values for a variable, are described as inequalities. Instead of a single value, the solutions to inequalities are sometimes stated as intervals of integers that meet the inequality. Every choice of x larger than 2 will meet the inequality, for instance, in the case of the inequality 2x + 3 > 7.

Let us suppose number of lawns mown = m.

The total earnings can be calculated as follows:

Total earnings = price per lawn x number of lawns

20m ≥ 380

m ≥ 19

Hence, Matthew needs to mow at least 19 lawns to make his goal of $380.

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Step-by-step explanation:

To find the average rate of change of the function f(x) over the interval [-2,4], we need to calculate the change in the function value divided by the change in the input variable over that interval:

Average rate of change = (f(4) - f(-2))/(4 - (-2))

First, we calculate f(4):

f(4) = √(4 - 2) = √2

Next, we calculate f(-2):

f(-2) = √(-2 - 2) = √(-4)

Since the square root of a negative number is not a real number, the function f(x) is not defined for x < 2. Therefore, the interval [-2,4] is not entirely within the domain of the function.

However, we can still find the average rate of change over the part of the interval that is within the domain of the function, which is [2,4]. Therefore, we need to modify the formula accordingly:

Average rate of change = (f(4) - f(2))/(4 - 2)

f(2) = √(2 - 2) = 0

Plugging in the values we get:

Average rate of change = (√2 - 0)/(4 - 2) ≈ 0.71

Therefore, the average rate of change of f(x) over the interval [-2,4] (within the domain of the function) to the nearest hundredth is 0.71.

Kennedy's average speed was 3554 miles per hour by using the formula of average speed.

Average speed is a measure of how fast something travels over a period of time, calculated by dividing the total distance traveled by the total time taken. It is usually expressed in units of distance per unit of time, such as miles per hour (mph) or kilometers per hour (km/h).

Distance is a measure of the physical space between two points, objects, or locations. It is usually expressed in units such as meters, kilometers, miles, feet, or yards.

To find Kennedy's average speed, we can use the formula:

average speed = total distance / total time

In this case, Kennedy drove 9494 miles in 2 2/3 hours. To convert the mixed number to an improper fraction, we can multiply the whole number by the denominator and add the numerator, then put the result over the denominator:

2 2/3 = (2 × 3 + 2) / 3 = 8/3

So Kennedy's total time was:

total time = 8/3 hours

Using the formula, we get:

average speed = 9494 miles / (8/3 hours)

To divide by a fraction, we can multiply by its reciprocal:

average speed = 9494 miles × (3/8 hours)

Simplifying, we get:

average speed = 3554.25 miles per hour

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The total costs of the 6 notebooks and 4 dry-erase markers that Roselyn buys are $19.70.

The total costs can be determined using mathematical operations.

The first mathematical operation used is the multiplication operation, involving the multiplicand and the multiplier, to determine the total cost of each item.

The second mathematical operation is the addition operation to determine the grand total.

Notebook: 1.95

Dry erase markers: 2.00

Notebook: $11.70 ($1.95 x 6)

Dry erase markers: $8.00 ($2.00 x 4)

Total costs = $19.70

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The price of each item is listed below

notebook: 1.95

dry erase markers: 2.00

What are the total costs?

The quotient in simplest form is [tex]x^3 * (x+1)/(x-4).[/tex]

A fractiοn represents a part οf a whοle οr, mοre generally, any number οf equal parts. When spοken in everyday English, a fractiοn describes hοw many parts οf a certain size there are, fοr example, οne-half, eight-fifths, three-quarters.

Numeratοrs and denοminatοrs are alsο used in fractiοns that are nοt cοmmοn, including cοmpοund fractiοns, cοmplex fractiοns, and mixed numerals.

In pοsitive cοmmοn fractiοns, the numeratοr and denοminatοr are natural numbers. The numeratοr represents a number οf equal parts, and the denοminatοr indicates hοw many οf thοse parts make up a unit οr a whοle.

Tο divide fractiοns, we invert the secοnd fractiοn and multiply it by the first. Sο:

4x⁵/12x² ÷ (x²-3x-4)/(3x+3)= (4x⁵/12x²) * (3x+3)/(x²-3x-4)

Inverted secοnd fractiοn and multiplied

= (4/12) * (x⁵/x²) * (3(x+1)/(x-4)(x+1))

Factοred the denοminatοr οf the secοnd fractiοn

= (1/3) * [tex]x^{(5-2)[/tex] * (3(x+1)/(x-4))

Simplified and cancelled οut cοmmοn factοrs[tex]= (1/3) * x^3 * (3(x+1)/(x-4))= x^3 * (x+1)/(x-4)[/tex]

Therefοre, the quοtient in simplest fοrm is  [tex]x^3 * (x+1)/(x-4).[/tex]

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Answer:

Step-by-step explanation:

(2+3) x 3 + 8/2 = 5 X 3 + 8/2 = 15 + 4 = 19

Lily increased the amount of protein she eats by 12.5% by eating every day from 48 g to 54 g.

How to calculate percentage for the given problem?

To find the percentage increase in the amount of protein that Lily eats, we can use the following formula:

Percentage increase = ((new value - old value) / old value) x 100%

Using this formula and plugging in the values given in the problem, we get:

Percentage increase = ((54 - 48) / 48) x 100%

Percentage increase = (6 / 48) x 100%

Percentage increase = 0.125 x 100%

Percentage increase = 12.5%

Therefore, Lily increased the amount of protein she eats by 12.5%.

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The probability that exactly 3 out of 6 dolphins are cured is approximately 0.3342.

This is a binomial probability problem with the following parameters:

n = 6 (number of trials)

p = 0.95 (probability of success, which is being cured)

q = 1 - p = 0.05 (probability of failure, which is not being cured)

The probability of exactly 3 dolphins being cured is given by the binomial probability formula:

P(X = 3) = (6 choose 3) * 0.95^3 * 0.05^3

where "6 choose 3" represents the number of ways to choose 3 dolphins out of 6.

Using a calculator, we can evaluate this expression as:

P(X = 3) = (6 choose 3) * 0.95^3 * 0.05^3

P(X = 3) ≈ 0.3342

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The two cars will be 380 miles apart after 3.5 hours after the first car leaves based on distance formula.

The formula for distance, which is rate times time, must be used to address this issue. Let x be the number of hours following the departure of the first car. The distances between the two cars are increasing since they are moving in different directions.

The first thing we must do is determine how far the first car, which left at 3:00 p.m., drove. When the rate is 55 miles per hour and the time is x hours, we may use the calculation distance = rate x time. Hence, the first car's mileage was 55 miles.

The second step is to determine how far the second car, which left at 4:00 p.m., travelled. When the speed is 75 miles per hour and the time is x - 1 hours, we can apply the same calculation (since the second car left one hour later than the first). Thus, the second car's mileage is 75(x - 1) miles.

The sum of the distances covered by each car is the overall distance between the two vehicles. So that we can create an equation:

distance of first car + distance of second car = total distance

55x + 75(x - 1) = 380

Simplify:

55x + 75x - 75 = 380

Combining:

130x = 455

Divide sides by 130 to obtain:

x = 3.5

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Answer:

75%

Step-by-step explanation:

Formula:
P = (x/y) * 100

where x is 6 dollars and y is 8 dollars.

P = (6/8) * 100
P = 0.75 * 100
P = 75%

Thus, number of students in seventh grade who can play instrument out of 77 are 37.

In general, the term "proportion" refers to a part, share, or amount that is compared to a whole. Depending on the definition of proportion, two ratios are in proportion when they are equal. Two ratios as well as fractions are equal when an equation or a declaration to that effect is utilised.

Whereas if ratio between the initial and second is identical to the ratio between of second and third, then each three quantities are referred to as having a continuing proportion.

Given data for the  seventh grade students:

Out of 100 ---> 48 can play instruments.

Out of 77 ---> x (say) can play instruments.

So,

100/77 = 48/x

x = 48*77 / 100

x = 36.96

x = 37 (students)

Thus, number of students in seventh grade who can play instrument out of 77 are 37.

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The equation in x is 2[tex]x^{2}[/tex]-3x-$27=0, which can be solved using the quadratic formula to find the value(s) of x that satisfy the equation. The expressions derived in parts (a) and (b) are used to set up an equation involving x.

To solve this problem, we need to use the information given in parts (a) and (b) to set up an equation involving x.

(a) Let the number of large sacks Paul buys be y. The cost of each large sack is given as x, so the total amount Paul spends is:

y * x = $27

Solving for y, we get:

y = 27/x

(b) Let the number of small sacks Rula buys be z. We are told that each small sack costs $2 less than a large sack, so the cost of each small sack is:

x - $2

The total amount Rula spends is $25, so we can set up an equation:

z * (x - $2) = $25

Simplifying this equation, we get:

z = 25/(x - $2)

(c) We are told that Rula buys 4 more sacks than Paul. Using the expressions we derived in parts (a) and (b), we can set up an equation:

z = y + 4

Substituting the expressions we derived in parts (a) and (b), we get:

25/(x - $2) = 27/x + 4

Multiplying both sides by x(x - $2), we get:

25x = 27(x - $2) + 4x(x - $2)

Simplifying this equation, we get:

25x = 27x - $54 + 4x² - 8x

Rearranging terms and simplifying, we get:

2x² - 3x - $27 = 0

So the equation in x is 2x²-3x-$27=0, which we can solve using the quadratic formula to find the value(s) of x that satisfy the equation.

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Answer: Reread the lesson and then you will figure it out

Step-by-step explanation:

We can write the absolute value inequality in the form |x−b| < c: |x−6| < 1

What is inequalities?

In mathematics, an inequality is a mathematical statement that indicates that two expressions are not equal. It is a statement that compares two values, usually using one of the following symbols: "<" (less than), ">" (greater than), "≤" (less than or equal to), or "≥" (greater than or equal to).

The solution set 5 < x < 7 can be rewritten as:

x > 5 (since x must be greater than 5)

x < 7 (since x must be less than 7)

To put this in the form |x−b| < c, we first find the midpoint between 5 and 7:

b = (5+7)/2 = 6

Then, we find the distance between b and either endpoint:

c = |7-6| = 1 (or |5-6| = 1)

Finally, we can write the absolute value inequality in the form |x−b| < c:

|x−6| < 1.

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Answer: any negative value

Step-by-step explanation:

g(x)= ax², inc on x<0 & dec on x>0

Firstly we need to get the derivative of g(x)

g'(x)=2ax

for inc interval g'(x) should be +ve

x<0 (i.e. x= -ve), then a must be -ve

for dec interval g'(x) should be +ve

x>0 (i.e. x= +ve), then a must be -ve

so in both cases a must be a negative constant

"The spread of the data distribution for Lake Mockingbird is 5 inches bigger than the spread of the data distribution for Lake Warbler," is the answer to question 2.

The graphs do not support this statement since the difference in spread between the two lakes is not represented as 5 inches. The right answer to question 1 is B: "The spread of the data distribution for Lake Mockingbird is approximately 40% higher than the spread for Lake Warbler." This is due to the fact that the data distribution of the Lake Mockingbird is around 60 inches (from 5 to 65), whereas the data distribution of the Lake Warbler is approximately 43 inches (from 2 to 45). The difference between the two ranges is approximately 60 - 43 = 17. inches. From 43 to 60, the percentage rise is around 39.5%, which is close to 40%. The correct answer to question 3 is B: "The distribution of Lake Mockingbird reveals a center that is 3 inches greater than the distribution of Lake Warbler." This assertion is false since the graphs do not show the center of each distribution and cannot be established with the information supplied. Based on the data in the graphs, the other claims are correct.

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Sorry for the late response but....

Answer:

36 cents

Step-by-step explanation:

First, we would want to calculate how much the box would sell for before the sister ate some.

We would get 38*29(in cents) and we can further get 1102 cents before the sister ate the candy bars.

The sister ate 7 candy bars leaving us with 31 candy bars. In order to deduct the price for each candy bar, it would be a situation like the following:

$6 for 3 boxes of 500 cookies (i know that's cheap)

6/3...

$2 per box.

Using our situation we get 1102 cents for 31 candy bars.

1102 cents/31...

35.5483871

That does seem unrealistic, so we round to the nearest whole number and we get...

36 cents

Therefore, Andrey's score was 65.4. Therefore, Susan's score was 79.

Standard deviation is a statistical measure that represents the amount of variation or dispersion in a set of data values. It measures the average distance of each data point from the mean of the data set. A low standard deviation indicates that the data points tend to be close to the mean, while a high standard deviation indicates that the data points are more spread out. It is calculated by taking the square root of the variance, which is the average of the squared differences of each data point from the mean. Standard deviation is commonly used in fields such as finance, engineering, and psychology to analyze and compare data sets.

Here,

a. To find Andrey's score, we need to use the formula:

z = (x - μ) / σ

where z is the number of standard deviations from the mean, x is the score, μ is the mean, and σ is the standard deviation.

Andrey was told that he scored 1.2 standard deviations below the mean, so we have:

z = -1.2

μ = 75

σ = 8

Plugging these values into the formula, we get:

-1.2 = (x - 75) / 8

Multiplying both sides by 8, we get:

-9.6 = x - 75

Adding 75 to both sides, we get:

x = 65.4

b. Similarly, to find Susan's score, we have:

z = 0.5

μ = 75

σ = 8

Plugging these values into the formula, we get:

0.5 = (x - 75) / 8

Multiplying both sides by 8, we get:

4 = x - 75

Adding 75 to both sides, we get:

x = 79

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As a result, the rectangular prism's volume in fully factored form is:

V = (x - 1) * (l * w * h)

A 3D form with six rectangular faces is referred to as a rectangular solid. A rectangular solid's volume can be calculated using the formula V = lwh, where l denotes the solid's length, w its width, and h its height.

In this instance, we are informed that the rectangular solid's height is 17 units. Also, we are informed that the solid's base is a rectangle with an area of (x-1) square units. We can assume that the solid has length l and width w because its base is a rectangle.

Solids with six rectangular faces are known as rectangular solids. They go by the name rectangular prisms as well. Following are some examples of rectangular solids in daily life:

Laptops, school notebooks, fish tanks, cargo containers, rooms, storage sheds, refrigerators, cereal boxes, tissue boxes, cars, and more.

As a result, we have:

l * w = x - 1

The rectangular solid's volume is:

V = lwh

With l * w = x - 1 and h = 17 as substitutes, we obtain:

V = (x - 1)lw

This phrase can be factored as follows:

V = (x - 1)l * w * h

Since l * w = x - 1 and h = 17, we have:

V = (x - 1) * l * w * h

V = (x - 1) * (l * w * h)

As a result, the rectangular prism's volume in fully factored form is:

V = (x - 1) * (l * w * h)

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Answer:

A/First picture

Step-by-step explanation:

The line touches the y axis at 3, as indicated by the +3 in the equation. In addition, the -1/2x indicated a downwards line.

Answer:

the first photo

Step-by-step explanation:

I hope this helps

Answer:

There are 10 possible digits that could appear on the license plate: 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. Half of these digits (1, 3, 5, 7, and 9) are odd.

Since there are three digits on the license plate, there are 10x10x10 = 1000 possible license plates.

To find the probability that the last digit is odd, we need to find the number of license plates where the last digit is odd and divide by the total number of possible license plates:

Number of license plates where last digit is odd = 10x10x5 = 500 (since there are 5 odd digits to choose from for the last digit)

Total number of possible license plates = 10x10x10 = 1000

So the probability of selecting a license plate at random where the last digit is an odd number is:

500/1000 = 0.5 or 50%

Hope This Helps!

Answer:

Any scale factor greater than 1 result in a expansion or increase in size. Any scale factor less than 1 result in a shrinkage or decrease in size.

What is a scale factor?

a scale factor is a ratio between the scale of a given original object(pre-image) and a new object, (after-image or image after transformation) which is the same shape but of a different size (bigger or smaller).

Example & how to use scale factor:

let's say we have a triangle with a side length of 2, 2, and 3.

then we take that triangle and dilate it with a scale factor of 2.

the new side lengths become 4, 4, and 6 because they are being multiplied by 2 because the scale factor is 2.

Explanation and answer:

1. A scale factor of 4 is an expansion because it's greater than 1

2. A scale factor of 9/7 or about 1.30 is an expansion because it's greater than one.

3. the rest are shrinkage scale factors because they're less than one.

Conclusion:

i hope this helps :)

geometry can be hard sometimes