Solve the problem.The volume of a sphere is increasing at a rate of 9 cm3/s. Find the rate of change of its surface area when its volume is 
cm3
A. 4.5 cm2/s
B. 
cm2/s
C. 3 cm2/s
D. 
cm2/s
Answer: A
Mathematics
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Solve the problem.Find the derivative of the function 
at the point 
in the direction in which the function decreases most rapidly.
A. -18 B. -9 C. -27 D. -8
Mathematics
Find the least common multiple (LCM) of the pair of numbers.12 and 20
A. 32 B. 4 C. 60 D. 240
Mathematics
Simplify the radical expression. Assume all variables represent nonnegative real numbers.
A. 405x
B. 9x
C. 9
D. 9x
Mathematics
Solve the problem.A fossilized leaf contains 25% of its normal amount of carbon 14. How old is the fossil (to the nearest year)? Use 5600 years as the half-life of carbon 14.
A. 25,959 years old B. 34,818 years old C. 2320 years old D. 11,180 years old
Mathematics