Find all solutions of the equation.7 cos x + 8
= 5 cos x+ 7
A. x = 
+ n? or x = 
+ n?
B. x = 
+ 2n? or x = 
+ 2n?
C. x = 
+ n? or x = 
+ n?
D. x = 
+ 2n? or x = 
+ 2n?
Answer: D
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Solve the problem.A certain ball when dropped from a height rebounds 
of the original height. How high will the ball rebound after the fifth bounce if it was dropped from a height of 32 feet? Round your answer to the nearest tenth of a foot.
A. 7.7 ft B. 6.7 ft C. 3.4 ft D. 5.4 ft
Add or subtract as indicated. Write the answer in lowest terms.
+ 
A. 
B. 
C. 
D. 
Determine whether the sequence is arithmetic.
, 
, 
, 
, 
, . . .
A. Arithmetic B. Not arithmetic
Solve the problem.Suppose the cost per ton, y, to build an oil platform of x thousand tons is approximated by 
What is the cost per ton for x = 50? Round your answer to the nearest hundredth, if necessary.
A. $456.52 B. $4725.00 C. $5250.00 D. $10.00