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 "9" button as a product of sines and cosines.
A. y = 2 sin (625?t) cos (2329?t)
B. y = 2 sin (2061?t) cos (357?t)
C. y = 2 sin (2329?t) cos (625?t)
D. y = 2 sin (357?t) cos (2061?t)
Answer: C
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Name the conic (horizontal ellipse, vertical hyperbola, and so on) corresponding to the given equation.
+ 
= 0
A. Horizontal hyperbola B. Vertical hyperbola C. Vertical parabola D. Horizontal parabola
Solve the given differential equation. (The form of yp is given.)36D2y - y = sin x (Let yp = A sin x + B cos x.)
A. y = c1ex/6 + c2e-x/6 - 
sin x + 
cos x
B. y = c1ex/6 + c2e-x/6 - 
sin x
C. y = c1ex/6 + c2e-x/6 + 
sin x
D. y = c1ex/6 + c2e-x/6 - 
cos x
Solve.The polynomial 0.35x - 62 models the relationship between the number of pretzels x that a certain vendor sells and the profit the vendor makes. Find the profit the vendor makes from selling 700 pretzels.
A. -$58.50 B. $183.00 C. $245.00 D. $638.00