Solve the problem.The loudness of a sound is measured in decibels (dB). The loudness L of a sound is related to its intensity I by the equation 
where I0 = 10-12 watts per square meter (W/m2) is the intensity of the faintest sound the human ear can detect. Find the intensity of a 72 dB sound.
A. I = 1019.2 W/m2
B. I = -4.810 W/m2
C. I = 10-4.8 W/m2
D. I = 10708 W/m2
Answer: C
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Find the limit.
sec-1 x
A. - 
B. 
C. -?
D. 0
Mark works forty hours a week at a clothing store. His weekly salary is $220, plus he receives a 5% commission on sales over $1,000. Given the functions f (x) = 0.05x and g(x) = x – 1,000, which of two compositions, ( f o g)(x) or (g o f )(x), represents Mark's commission?
A. ( f o g)(x) B. (g o f )(x)
Solve the initial value problem.
= e2t + 8 sin t, y(0) = 0, y'(0) = 5
A. y = 
- 8 sin t
B. y = 
- 8 sin t + 5t - 
C. y = e2t - 8 sin t + 12t - 
D. y = 
- 8 sin t + 
t - 
Round the divisor and dividend to one nonzero digit to find the estimated quotient. Then find the exact quotient.
A. 400; 408 B. 200; 400 r8 C. 400; 400 r8 D. 600; 408