4. CONES A cone with a fixed height of 10 inches is shown on a computer screen. An animator increases the radius r
at a rate of 3 inches per minute. Which of the following gives the volume v(r) of the cone as a function of time f(t)?
Assume the radius is 3 inches at /= 1.
a. [v-] (x)- 10x²
b. [v-] (x)-30x²
c. [v-] (x)-10²
d. [v-] (x)-30x²
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