3 years ago

Help please help 10

Mathematics

2 answers:

Lelechka [254]3 years ago

6 0

The answer is 160 you are correct

Ivahew [28]3 years ago

6 0

Volume = $\frac{Length*Width*Height}{3}$
Multiply: Length x Width x Height
15 x 4 = 60
60 x 8 = 480
Divide by 3
480 / 3 = 160
160 is your answer

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Step-by-step explanation:

Surface area of an snowball

The surface area of an snowball has the following equation:

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In which d is the diameter.

Implicit differentiation:

To solve this question, we differentiate the equation for the surface area implictly, in function of t. So

$\frac{dS_{a}}{dt} = 2d\pi\frac{dd}{dt}$

Surface area decreases at a rate of 3 cm2/min

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Tind the rate (in cm/min) at which the diameter decreases when the diameter is 9 cm.

This is $\frac{dd}{dt}$ when $d = 9$ . So

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$\frac{dd}{dt} = -\frac{3}{18\pi}$

$\frac{dd}{dt} = -0.053$

The diameter decreases at a rate of 0.053 cm/min.

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