3 years ago

Which descriptions from the list below accurately describe the relationship

Mathematics

1 answer:

Pachacha [2.7K]3 years ago

8 0

Answer:

B is the answer

Step-by-step explanation:

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The rate a which the surface area, S, decreases is
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The surface area is
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Therefore
$\frac{dS}{dt} = \frac{dS}{dr} \frac{dr}{dt} =8 \pi r \frac{dr}{dt} \\\\ -8 \pi = 8 \pi r \frac{dr}{dt} \\\\ \frac{dr}{dt} =- \frac{1}{r}$

When r = 3 cm, obtain
$\frac{dr}{dt}]_{r=3} = - \frac{1}{3} \, cm/s$

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He should boil 12.5 gallons of water for 5 cups of oats.

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