Solve the problem.If a rock falls from a height of 80 meters on Earth, the height H (in meters) after x seconds is approximately H(x) = 80 - 4.9x2.When does the rock strike the ground? Round to the nearest hundredth, if necessary.
A. 16.33 sec
B. 3.33 sec
C. 4.04 sec
D. 1.83 sec
Answer: C
Mathematics
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Solve.A certain drug comes in 1500-mg pills. How many of these pills do you have to take to get a dosage of half a gram?
A. 4 pills
B. 
pill
C. 
pill
D. 3 pills
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Find all solutions.x3 - 121x = 0
A. {0, 11, -11} B. {0, -11} C. {0, 121} D. {0, 11}
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Find the volume of the indicated region.The region bounded by the cylinders 
and the planes 
A. 308? B. 77? C. 231? D. 154?
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Solve the problem.The following graph shows data for a recent train ride from New York to Toronto. At what rate did the train travel?
A. 60 miles per hour B. 50 miles per hour C. 120 miles per hour D. 65 miles per hour
Mathematics