Find the sum using the formulas for the sums of powers of integers.
?
?
A. 21
B. 42
C. 546
D. 441
E. 91
Answer: E
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Solve the problem.A right circular cylinder is obtained by revolving the region enclosed by the line x = r, the x-axis, and the line 
about the y-axis. Find the volume of the cylinder.
A. ?rh2 B. ?rh C. 2?r2h D. ?r2h
Use a graphing calculator to solve the nonlinear system. Give x- and y-coordinates to the nearest hundredth.x2 - y2 = 7.82x = 2y - 5
A. {(-2.97, -1.01), (6.31, -5.65)} B. {(-6.31, -5.65), (2.97, -1.01)} C. {(-6.31, 5.65), (2.97, 1.01)} D. {(-2.97, 1.01), (6.31, 5.65)}
If possible, evaluate the expression by hand. If not, approximate the answer to the nearest hundredth.
1/2
A. - 
B. - 
C. 
D. 
Solve the problem using matrices.Jerry has 3 pieces of string. The total length is 110 inches. The sum of the two longer pieces is 90. The middle piece is twice as long as the shortest piece. What are the lengths of the 3 pieces?
A. 10, 20, and 80 inches B. 20, 50, and 60 inches C. 20, 40, and 50 inches D. No solution