Solve the problem.The length a spring is stretched from its natural length with work, W
is given by L = 
where k is a constant for the given spring. If a certain spring has a constant of 61.8, and the spring is to be stretched 1.9 feet from its natural length, how much work will be necessary? Round your answer to the nearest tenth.
A. 223.1 foot-pounds
B. 58.7 foot-pounds
C. 111.5 foot-pounds
D. 42.6 foot-pounds
Answer: C
Mathematics
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Solve the problem.Find the volume of the solid generated by revolving the region in the first quadrant bounded by the x-axis and the curve y = x cos x, 0 ? x ? ?/2 about the y-axis.
A. 
+ 2?2 - 4?
B. 
- 8?
C. 
- 4?
D. 
- 4?
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Evaluate.-63
A. -18 B. 216 C. -216 D. 18
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Find a cofunction with the same value as the given expression.csc 
A. csc 
B. sec 
C. csc 
D. cot 
Mathematics
Determine the x- and y-intercepts on the graph of the equation.y = x + 7
A. x-intercept is 1; y-intercept is 7 B. x-intercept is 7; y-intercept is -7 C. x-intercept is 0; y-intercept is 0 D. x-intercept is -7; y-intercept is 7
Mathematics