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2 years ago

Pls answer this with an explanation if you can

Mathematics

1 answer:

nika2105 [10]2 years ago

4 0

Answer:

Step-by-step explanation:

Decreased amount = 21.95 - 15.88 = 6.07

Sales percentage = 6.07/21.95 * 100 = 27.65% ≈ 28%

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We have been given that a circle of a certain radius has an area which is numerically 5 times the value of the circumference. We are asked to find the radius of the circle.

We know that area of circle with a radius of r units is $\pi r^2$ .

We know that circumference of a circle is $2\pi r$ .

5 times the value of circumference would be $5(2\pi r)=10\pi r$ .

Now we will equate 5 times circumference with area as:

$\pi r^2 = 10\pi r$

Let us solve for r.

$\pi r\cdot r = 10\pi r$

$\frac{\pi r\cdot r}{\pi r}=\frac{10\pi r}{\pi r}$

$r=10$

Therefore, the radius of the circle would be 10 units.

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2 years ago

Two cities are 3 1/2 inches apart on a map the map scale says that 1/4 inch is 1 mile how many miles apart are the two cities

maria [59]

Answer:

every 1/4 inch on the map is 1 mile.

You need to find the number of 1/4 inches there are in 3 1/2 inches.

There are four 1/4 inches per inch.

3 x 4 = 12

There are two 1/4 inches in 1/2 inch.

12+2 = 14

The cities are 14 miles apart.

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2 years ago

If x2+y2 = 12 and x2-y2=18, what is the value of x4-y4?

nataly862011 [7]

Answer:

Step-by-step explanation: add the equations

2x² = 30

x² = 15

y² = 12 - 15

= -3

x4 -y4 = 15² - (-3)²

= 216

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