Choose the equation that matches the graph.
A. 
- 
= 1
B. 
+ 
= 1
C. 
- 
= 1
D. 
+ 
= 1
Answer: D
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Solve the problem.Use the formula D = 10.0 log (S/S0), where the loudness of a sound in decibels is determined by S, the number of watt/m2 produced by the soundwave, and S0 = 1.00 × 10-12 watt/m2. What is the intensity in watt/m2 of a noise measured at 76 decibels? (Round to an appropriate number of significant digits.)
A. 4.0 × 10-4 watt/m2 B. 4.0 × 10-5 watt/m2 C. 2.0 × 1015 watt/m2 D. 7.6 × 10-10 watt/m2
Find all real numbers that satisfy the equation.7 cos x + 5
= 5 cos + 4
A. x = 
+ 2n? or x = 
+ 2n?
B. x = 
+ n? or x = 
+ n?
C. x = 
+ 2n? or x = 
+ 2n?
D. x = 
+ n? or x = 
+ n?
Solve graphically.y = 2x - 14x - 2 = 2y
A. No solution B. (0, 1) C. Infinitely many solutions D. (0, -1)
Find the slope and y-intercept of the line.9x + y = -3
A. slope = -9; y-intercept = -3
B. slope = 9; y-intercept = -3
C. slope = - 
; y-intercept = - 
D. slope = - 3; y-intercept = - 