Solve the problem.A rock falls from a tower that is 78.4 m high. As it is falling, its height is given by the formula 
with t in seconds. How many seconds will it take for the rock to hit the ground (h = 0)?
A. 1254.4 sec
B. 4 sec
C. 8.6 sec
D. 8.9 sec
Answer: B
Mathematics
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Solve the problem.The radius of the tires of a car is 18 inches, and they are revolving at the rate of 651 revolutions per minute. How fast is the car traveling in miles per hour?
A. 
? mph
B. 
? mph
C. 
? mph
D. 
? mph
Mathematics
Write the sum of the geometric series as a rational number.0.69 + 0.0069 + 0.000069 + ...
A. 
B. 
C. 
D. 
Mathematics
Let U = {3, 5, 9, 12, 13, 17}, A = {3, 5, 12, 17}, and B = {9, 13}. Find A - B.
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Mathematics
Find any numbers for which the rational expression is undefined.
A. a = 7 B. a = -7 C. none D. a = 7, a = 9
Mathematics