The volume of a right-circular cylinder of radius r and height h is 
.
?
Suppose the radius and height of the cylinder are changing with respect to time t. At a certain instant of time, the radius and height of the cylinder are 6 and 3 in. and are increasing at the rate of 0.4 and 0.1 in./sec, respectively. How fast is the volume of the cylinder increasing?
?
A. 18 in3/sec
B. 10.7 in3/sec
C. 22.7 in3/sec
D. 9.4 in3/sec
Answer: A
Mathematics
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