Simplify.
- 
? 
A. 
B. 
C. 
D. 1
Answer: A
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Solve the problem.The sound produced by touching each button on a touch-tone phone is described by y = sin 2?lt + sin 2?htwhere l and h are the low and high frequencies (cycles per second) in the figure shown.
Describe the sound emitted by touching the 0 key as a product of sines and cosines.
A. y = 2 sin(536?t) cos(2418?t) B. y = 2 sin(395?t) cos(2277?t) C. y = 2 sin(2418?t) cos(536?t) D. y = 2 sin(2277?t) cos(395?t)
Determine if the given function y = f(x) is a solution of the accompanying differential equation.Differential equation: y' = e- 6x - 6yInitial condition: y(- 6) = 0Solution candidate: y = (x + 6)e- 6x
A. No B. Yes
Fill in the blanks to complete the sentence.The fraction 
represents 
of the 
equal parts into which a whole is divided.
A. 19, 32
B. 
, 32
C. 
, 19
D. 32, 19
Use an annuity table to solve the problem. Round to the nearest cent.The Greenes want to buy a new car and would like to have $9000 to put down on it. They can save $450 a quarter. If they deposit this amount in an account paying 6% compounded quarterly, how long will it be before they can purchase the car?
A. 3
years
B. 4
years
C. 4
years
D. 4 years