3 years ago

The ace telephone co. charges a flat monthly fee of $22.00 for a telephone line and $0.20 per minute for long distance calls. Sk

etch a graph of this equation for up to 100 minutes of calls

Mathematics

1 answer:

Trava [24]3 years ago

7 0

$y = .2x + 22$

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Scrat [10]

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The rate of change in surface area when r = 20 cm is 20,106.19 cm²/min.

Step-by-step explanation:

The area of a sphere is given by the following formula:

$A = 4\pi r^{2}$

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Assume that the radius r of a sphere is expanding at a rate of 40 cm/min.

This means that $\frac{dr}{dt} = 40$

Determine the rate of change in surface area when r = 20 cm.

This is $\frac{dA}{dt}$ when $r = 20$ . So

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Applying implicit differentiation.

We have two variables, A and r, so:

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