Find the instantaneous rate of change for the function at the given value.f(x) = 5x + 9 at x = 2
A. 10
B. 0
C. 5
D. 9
Answer: C
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Find the prime factorization of the number.72
A. 2 ? 2 ? 2 ? 3 ? 5 B. 2 ? 2 ? 2 ? 3 C. 2 ? 2 ? 2 ? 3 ? 3 D. 2 ? 2 ? 2 ? 2 ? 3 ? 3
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
Solve the problem.A window washer accidentally drops a bucket from the top of a 144-foot building. The height h of the bucket after t seconds is given by 
When will the bucket hit the ground?
A. -3 sec B. 9 sec C. 3 sec D. 48 sec
Simplify the expression. Include absolute value bars where necessary.
A. - 
x
B. 
x
C. -4x
D. 4x