Subtract. Write the answer in lowest terms as a mixed number.
A. 11
B. 12
C. 13
D. 12
Answer: D
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Set up an integral for the length of the curve.y = 2 cot x, 
? x ? 
A. 
B. 
C. 
D. 
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 2.6 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) = 2.6?t2 B. (A ? r)(t) = 5.2?t2 C. (A ? r)(t) = 6.76?2t D. (A ? r)(t) = 6.76?t2
Solve the logarithmic equation.log x = 2
A. 0.2 B. 20 C. 100 D. 2
Consider the following simplex tableau that is the final tableau in a problem to minimize -x + 2y.
What are the values of x and y when the minimum value of -x + 2y occurs?
A. x = -20, y = 6 B. x = 10, y = 3 C. x = -10, y = -3 D. x = 10, y = 0 E. none of these