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(395?t) cos(2277?t)
B. y = 2 sin(536?t) cos(2418?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.24
A. 5 B. 8 C. 6 D. 16
Let ? be an angle in standard position. Name the quadrant in which the angle ? lies.tan ? < 0, sin ? < 0
A. quadrant III B. quadrant I C. quadrant II D. quadrant IV
Perform the indicated operation and express in lowest terms.
- 
A. 5x - 5y
B. 
C. 
D. 5y - 5x
Solve the problem.A store is discounting all regularly priced items by 25%. (i) Find a function f that computes the sale price of an item having a regular price of x. (ii) If an item normally costs $190.91, what is its sale price?
A. f(x) = 0.25x; $47.73 B. f(x) = x - 0.25x; $143.18 C. f(x) = x - 25; $165.91 D. f(x) = x - 0.25; $190.66