Solve the problem.A water tank is shaped like an inverted cone with height 18 m and base radius 3 m (see figure). If the tank is full, how much work is required to pump the water to the level of the top of the tank and out of the tank? Express the answer in terms of ?. 
A. 85,730,400? J
B. 14,288,400? J
C. 1,587,600 J
D. 2,381,400? J
Answer: D
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Use the graph of the function f(x) to locate the local extrema and identify the intervals where the function is concave up and concave down.
A. Local minimum at x = +1; local maximum at x =-1; concave up on (0, ?); concave down on (-?, 0) B. Local minimum at x = +1; local maximum at x =-1; concave down on (0, ?); concave up on (-?, 0) C. Local maximum at x = +1; local minimum at x =-1; concave up on (0, ?); concave down on (-?, 0) D. Local maximum at x = +1; local minimum at x =-1; concave up on (-?, ?)
Combine like terms.11x + 3x4 + 6x4 + 11x
A. 31x B. 11x + 3x4 + 6x4 + 11x C. 31x4 D. 9x4 + 22x
Solve the problem.A circular hole is filled with concrete to make a footing for a load-bearing pier. The hole measures 17 inches across and requires 1.6 bags of concrete in order to fill it to ground level. What is the depth of the hole? Round your answer to the nearest inch. (One bag of concrete, when mixed with the appropriate amount of water, makes 1800 in.3 of material.)
A. 10 in. B. 13 in. C. 17 in. D. 19 in.
Find an expression for the nth term of the arithmetic sequence.1, -4, -9, -14, -19, . . .
A. an = -11 - 5n B. an = 5n - 6 C. an = -5n + 6 D. an = -5n - 6