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)
Answer: D
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Evaluate the integral. 
A. 
- 3 sec -1 
+ C
B. ln 
- 
+ C
C. 
- 3 sec -1 
+ C
D. ln 
- 
+ C
Solve the problem.A pair of ropes needs adjustment. One rope is 57 inches and the other is 41
inches. Find how much the longer rope should be shortened to make both ropes the same length.
A. 7
in.
B. 98
in.
C. 16
in.
D. 15
in.
Identify the equation as a parabola, circle, ellipse, or hyperbola.9x2 = 4y2 + 36
A. Ellipse B. Parabola C. Circle D. Hyperbola
Find the probability to the nearest hundredth that the random variable of the probability density function has a value greater than the mean.f(x) = 
; [3, 6]
A. 0.50 B. 0.41 C. 0.48 D. 0.53