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Harlamova29_29 [7]
3 years ago
10

A circular swimming pool has a radius of 28 ft. There is a path all the way around the pool that is 4 ft wide. A fence is going

to be built around the outside edge of the pool path.
Mathematics
1 answer:
rewona [7]3 years ago
4 0

Answer:

Step-by-step explanation:

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The value of y varies directly with x, and y=3 when x=9 find y when x = 21
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Step 1) plug in 3 for y and 9 for x in the direct variation formula, which is y = kx

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Step 2) Solve for k

3 = k(9) (Divide by 9 on both sides)

3/9 = k (Now simplify 3/9)

1/3 = k. So k = 1/3

*just FYI: “k” is the constant of variation.

Step 3) use the equation y = kx and plug in 1/3 for k

y = 1/3x

Step 4) using the equation y = 1/3x, plug in 21 for x.

y = 1/3(21) (1/3*21 is the same as 21/3)

y = 21/3 (21/3 = 7)

y = 7. So that’s you’re answer! When x=21, y=7 because 7 is 1/3 of 21!

Hope this helps! My best wishes to you as you go through school!

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