Rewrite the expression as an equivalent expression that does not contain powers of trigonometric functions greater than 1.f(x) = sin4 x
A. 
- 
cos 2x + 
cos 4x
B. 
+ 
cos 2x
C. 
- 
cos 2x
D. 
- 2 cos 2x + 
cos 4x
Answer: A
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Part of $7,000 is invested at 10%, another part at 11%, and the remainder at 12% yearly interest. The total yearly income from the three investments is $795. The sum of the amounts invested at 10% and 11% equals the amount invested at 12%. How much is invested at each rate?
A. $1,000 at 10%, $2,500 at 11%, and $3,500 at 12% B. $500 at 10%, $2,000 at 11%, and $4,000 at 12% C. $1,500 at 10%, $2,000 at 11%, and $3,500 at 12% D. $500 at 10%, $2,500 at 11%, and $4,000 at 12% E. $1,500 at 10%, $3,000 at 11%, and $3,000 at 12%
Use the compound interest formulas A = P
nt and 
to solve.Find the accumulated value of an investment of $1,900 at 8% compounded quarterly for 2 years.
A. $2,216.16 B. $2,226.15 C. $2,204.00 D. $1,976.76
Solve the compound inequality. Express the solution using interval notation. Graph the solution set.15 ? 
x + 8 < 36
A. [2, 3)
B. [2, 8)
C. (2, 3]
D. (2, 8]
Use a double integral to find the volume of the solid shown in the figure.
What will be an ideal response?