Find the derivative of the function and evaluate f'(x) at the given value of x.
?
?
A. 
B. 
C. 
D. 
Answer: C
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Solve the problem.A stone is thrown into a pond. A circular ripple is spreading over the pond in such a way that the radius is increasing at the rate of 2.1 feet per second. Find a function, r(t), for the radius in terms of t. Find a function, A(r), for the area of the ripple in terms of r. 
A. (A ? r)(t) = 4.41?t2 B. (A ? r)(t) = 4.2?t2 C. (A ? r)(t) = 2.1?t2 D. (A ? r)(t) = 4.41?2t
Solve the problem.The percentage of registered voters who voted in this election was 54%, up 20% from the last election. What was the percentage that voted at the last election?
A. 34% B. 45% C. 64.8% D. 43.2%
Find the indicated derivative.Find y " if y = 5x sin x.
A. y " = - 5x sin x B. y " = 10 cos x - 5x sin x C. y " = 5 cos x - 10x sin x D. y " = - 10 cos x + 5x sin x
Solve the logarithmic equation.log7x = -2
A. 
B. 128
C. 49
D. 