Solve the problem.A rock falls from a tower that is 480 feet high. As it is falling, its height is given by the function 
How many seconds will it take for the rock to land on the ground?
A. 21.9 seconds
B. 14,400 seconds
C. 21.5 seconds
D. 5.5 seconds
Answer: D
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Evaluate the integral by making a substitution and then using a table of integrals.
A. ln 
+ sin t + C
B. ln 
- sin t + C
C. ln 
- sin t + C
D. ln 
+ cos t + C
Determine if the relation is a function. Assume x is the independent variable.{(-1, 6), (1, 4), (4, 2), (7, -2)}
A. Yes B. No
Solve the problem.The velocity v in feet per second of a free-falling object can be found using the formula 
, where d is the distance (in feet) that the object has already fallen. Find the distance that and object with a velocity of 68 ft/s has fallen. Round to the nearest foot.
A. 63 feet B. 66 feet C. 72 feet D. 74 feet
Divide.
Round to the nearest thousandth.
A. 88.357 B. 88.367 C. 8835.723 D. 8.8357