Solve the problem.On a Touch Tone phone, each button produces a unique sound. The sound produced is the sum of two tones and is given by 
and y = sin (2?ht), where l and h are the low and high frequencies (in hertz = Hz) associated with that button. 
The tone produced is thus given by y = sin (2?lt) + sin (2?ht). Write an expression that models the tone by pressing the "5" button as a product of sines and cosines.
A. y = 2 sin (2247?t) cos (707?t)
B. y = 2 sin (707?t) cos (2247?t)
C. y = 2 sin (566?t) cos (2106?t)
D. y = 2 sin (2106?t) cos (566?t)
Answer: D
Mathematics
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A. 
sin 16x
B. 2 sin 4x
C. cos 8x
D. cos 4x
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Write a set representing the statement.The natural-number multiples of 4 greater than 11 and less than 61
A. {12, 20, ..., 60} B. {12, 16, 20, ..., 60} C. {16, 20, ..., 60} D. {11, 61}
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Let 
. Find the domain of the composite function.
?
?
A. 
B. 
C. 
D. 
E. 
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Find the expression identical to the one given.
?
?
A. 
B. ?
C. ?
D. ?
E. ?
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