Solve the problem.The period of vibration P for a pendulum varies directly as the square root of the length L. If the period of vibration is 4 sec when the length is 64 inches, what is the period when 
(Round to the nearest hundredth.)
A. 5.00 sec
B. 4.75 sec
C. 1.13 sec
D. 4.50 sec
Answer: C
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Find two sets of parametric equations for the given rectangular equation.y = x2 - 6
A. x = -t, y = t2 - 6; x = 
, y = -t + 6, t ? 0
B. x = -t, y = t2 + 6; x = 
, y = t - 6
C. x = t, y = t2 - 6; x = 
, y = t - 6, t ? 0
D. x = t, y = t2 - 6; x = 
, y = t + 6, t ? 0
Solve the problem.From the edge of a 1000-foot cliff, the angles of depression to two cars in the valley below are 21° and 28°. How far apart are the cars? Round your answers to the nearest 0.1 ft.
A. 714.4 ft B. 713.4 ft C. 724.5 ft D. 724.4 ft
Solve the problem.A survey of senior citizens at a doctor's office shows that 45% take blood pressure-lowering medication, 48% take cholesterol-lowering medication, and 7% take both medications. What is the probability that a senior citizen takes either blood pressure-lowering or cholesterol-lowering medication? Express the answer as a percentage
A. 0% B. 4% C. 86% D. 100%
Each matrix is nonsingular. Find the inverse of the matrix. Be sure to check your answer.
A. 
B. 
C. 
D. 