The Radius of a Circular Puddle Is Growing at a Rate

question 82

Multiple Choice

The radius of a circular puddle is growing at a rate of 2 cm/s. How fast is the area growing at the instant when it equals 20 cm ²?

• A)32 cm ²/s
• B)10 cm ²/s
• C)251 cm ²/s
• D)16 cm ²/s
• E)18 cm ²/s

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