Find A-1 if it exists.A = 
A. 
B. 
C. 
D. 
Answer: D
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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)
Solve the problem.The function f computes the annual interest paid on savings of x dollars with an interest rate of 9%. The graph of f and the horizontal line 
are shown in the figure. Determine the savings amounts that result in (i) an annual interest less than $3.78 and (ii) an annual interest of $3.78 or more. 
A. between $6 and $42; $42 or more B. $42 or more; $42 C. between $0 and $42; $42 or more D. $42 or less; between $42 and $48
Solve.
= 1 + 
A. 0, 81
B. 0, 121
C. 0, 169
D. 0, 
Solve the compound inequality. Other than ?, use interval notation to express the solution set and graph the solution set on a number line.4 < 2x ? 10
A. (-?, 2) ? [5, ?)
B. [2, 5)
C. (-?, 2] ? (5, ?)
D. (2, 5]