Find the inverse of the function, and state the domain and range of the inverse function.f(x) = 5 cos (2x) + 8 for 0 ? x ? 
A. f-1(x) = 
cos-1 
; domain = [3, 13]; range = 
B. f-1(x) = 
cos-1 
; domain = [-13, 13]; range = 
C. f-1(x) = 
cos-1 
; domain = [3, 13]; range = 
D. f-1(x) = 
cos-1 
; domain = [3, 13]; range = 
Answer: A
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State the domain of the rational function.f(x) = 
A. (-?, -63) ? (-63, ?) B. (-?, ?) C. (-?, 9) ? (9, ?) D. (-?, -9) ? (-9, ?)
Apply the Quotient Rule and simplify the expression. Write the result with positive exponents only.
A. c10
B. 
C. 
D. 
Solve.Linda invests $25,000 for one year. Part is invested at 5%, another part at 6%, and the rest at 8%. The total income from all 3 investments is $1600. The income from the 5% and 6% investments is the same as the income from the 8% investment. Find the amount invested at each rate.
A. At 5%: $5000; at 6%: $10,000; at 8%: $10,000 B. At 5%: $8000; at 6%: $10,000; at 8%: $7000 C. At 5%: $10,000; at 6%: $10,000; at 8%: $5000 D. At 5%: $10,000; at 6%: $5000; at 8%: $10,000
Identify where f is increasing and where f is decreasing.f(x) = -
A. increasing: never; decreasing: [5, ?) B. increasing: [5, ?); decreasing: never C. increasing: never; decreasing: [-5, ?) D. increasing: [-5, ?); decreasing: never