Use the half-angle formulas to simplify the expression.
?
?
?
A. ?- ?|cos x|
B. ?|cos x|
C. ??|cos 4x|
D. ??- |cos 4x|
E. ?- ?|cos 8x|
Answer: C
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Calculate. Write answer in lowest terms.
- 
A. 
B. 
C. 
D. 
Solve using the addition principle.4.9 = x + 8.8
A. 3.9 B. 13.7 C. 0.56 D. -3.9
Provide an appropriate response.The gross asset value is the value of one share of a mutual fund.
A. True B. False
Solve the problem.The function f(t) = -0.13t2 + 0.5t + 30.5 models the U.S. population in millions, ages 65 and older, where t represents years after 1990. The function g(t) = 0.55t2 + 11.62t + 108 models the total yearly cost of Medicare in billions of dollars, where t represents years after 1990. What does the function 
represent? Find 
(15).
A. Cost per person in thousands of dollars. $0.02 thousand B. Cost per person in thousands of dollars. $8.11 thousand C. Cost per person in thousands of dollars. $0.17 thousand D. Cost per person in thousands of dollars. $46.41 thousand