Solve. Then graph. Write the solution set using interval notation.
> 4 
A. (-?, 16)
B. (16, ?)
C. [16, ?)
D. (-?, 16]
Answer: B
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Solve the problem.A swimming pool has a rectangular base 12 ft long and 24 ft wide. The sides are 5 ft high, and the pool is half full of water. How much work will it take to empty the pool by pumping the water out over the top of the pool? Assume that the water weighs 62.4 lb/ft3. Give your answer to the nearest ft ? lb.
A. 168,480 ft ? lb B. 224,640 ft ? lb C. 84,240 ft ? lb D. 112,320 ft ? lb
Find the limit.
cos-1 x
A. 1 B. -1 C. 0 D. ?
Find the reciprocal.
A. 
B. 
C. 
D. 
Solve the problem.A line from the top of a cliff to the ground passes just over the top of a pole 9.0 ft high and meets the ground at a point 7.0 ft from the base of the pole. If the point is 68 ft from the base of the cliff, how high is the cliff? Round to the nearest unit.
A. 8 ft B. 612 ft C. 4284 ft D. 87 ft