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3 years ago

Need help! Can anyone please help me? It would be much appreciated. Please view the attached photo. Will mark as brainliest!

Mathematics

1 answer:

seraphim [82]3 years ago

6 0

Answer:

B) 0.0073 mm/s

Step-by-step explanation:

The rate of change of area is the product of the circumference and the rate of change of radius:

dA/dt = C·dr/dt

dr/dt = (dA/dt)/C

Of course, C = 2πr, so ...

dr/dt = (7 mm²/s)(2π·152 mm) ≈ 7/955.04 mm/s ≈ 0.0073 mm/s

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