Solve the problem.On a Touch-Tone phone, each button produces a unique sound. The sound produced is the sum of two tones, given by y = sin (2?lt) and y = sin (2?ht)where l and h are the low and high frequencies (cycles per second) shown on the illustration.
The sound produced is thus given by y = sin (2?lt) + sin (2?ht)Write the sound emitted by touching the 4 key as a product of sines and cosines.
A. y = 2 sin (439?t) cos (1,979?t)
B. y = 2 sin (2,106?t) cos (566?t)
C. y = 2 sin (566?t) cos (2,106?t)
D. y = 2 sin (1,979?t) cos (439?t)
Answer: D
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To compare the value of amounts received at different times in the future, dollar amounts
A. may be restated to their present value through discounting or restated to their future value by compounding. B. must be converted to a single sum. C. must be restated to their future value by adding the compound interest to date. D. must be restated to their present value by removing the interest from the amount to be received in the future.
Solve using the multiplication principle.2.7x = 21.6
A. 
B. 18.9
C. 13.6
D. 8
Use the information given about the angle ?, 0 ? ? ? 2?, to find the exact value of the indicated trigonometric function.sin ? = 
, 0 < ? < 
Find cos (2?).
A. - 
B. 
C. - 
D. 
Evaluate.
, for x = 10 and y = 53
A. 6 B. 7 C. 5 D. 8