A circular parchment is being unrolled so that its radius increases at

MATHEMATICS · Single correct · AP · Calculus AB · Contextual Applications of Differentiation · Contextual Applications of Differentiation

Problem

2\,\text{cm}/\text{s}

. When the radius is

5\,\text{cm}

, how fast is the area of the parchment increasing? (a)

50\pi\,\text{cm}^2/\text{s}

(b)

20\,\text{cm}^2/\text{s}

(c)

20\pi\,\text{cm}^2/\text{s}

(d)

10\pi\,\text{cm}^2/\text{s}