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 "7" button as a product of sines and cosines.
A. y = 2 sin (357?t) cos (2061?t)
B. y = 2 sin (484?t) cos (2188?t)
C. y = 2 sin (2188?t) cos (484?t)
D. y = 2 sin (2061?t) cos (357?t)
Answer: D
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Graph the function, showing all asymptotes (those that do not correspond to an axis) as dashed lines. List the x- and y-intercepts.f(x) = 
A. No x-intercepts, no y-intercepts ;
B. No x-intercepts, no y-intercepts ;
C. No x-intercepts, no y-intercepts ;
D. No x-intercepts, no y-intercepts ;
Provide an appropriate response.Suppose that A is an m × n matrix and B is a p × q matrix. Under what conditions will the sum A + B exist?
A. The sum will always exist. B. The sum will exist if m = p and n = q. C. It is not possible for the sum to exist. D. The sum will exist if n = p.
Evaluate the polynomial with the given replacement value.-4q + 6, q = 7
A. -22 B. -34 C. 2 D. -56
Tell whether the fractions are equivalent or not equivalent.
and 
A. Equivalent B. Not equivalent