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 dB level of a radio at average volume from 9 feet away when it has an intensity of 
W/m2.
A. ? 63 dB
B. ? 73 dB
C. ? 53 dB
D. ? 43 dB
Answer: A
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Estimate by rounding as directed.19.987 + 0.582 + 79.99; nearest tenth
A. 100.9 B. 100.6 C. 99.7 D. 100.4
Solve the problem.If an object is thrown upward with an initial velocity of 13 feet per second, its height is given by 
after time t seconds. What is its maximum height?
A. 172 ft B. 39 ft C. 169 ft D. 117 ft
Determine the local extrema of the function.f(x, y) = x2 + xy + y2 - 3x + 2
A. f(-2, 1) = 11, maximum B. f(2, -1) = -1, maximum C. f(-2, 1) = 11, minimum D. f(2, -1) = -1, minimum
Below is a sketch of f(x) = (x - 1) ex . 
On a ty-coordinate system, sketch the solutions to the differential equation 
corresponding to the initial conditions 
, 
, and 
. Does the following graph
represent this situation? 
Enter "yes" or "no".
Fill in the blank(s) with the appropriate word(s).