For problems 1-15, perform the indicated operations and simplify.
A. 
B. 
C. 
D. 
E. none of these
Answer: D
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Find the domain of the composite function f?g. Write the domain in interval notation.f(x) = x + 7, g(x) = 
A. (-?, ?) B. (-?, -10) ? (-10, ?) C. (-?, -10) ? (-10, -7) ? (-7, ?) D. (-?, -17) ? (-17, ?)
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 inequality. Graph your solution on a number line, and write your solution in interval notation.a - 7 < -10 
A. (-?, -3)
B. (-?, -3]
C. (-3, ?)
D. [-3, ?)
Use Euler's method to approximate the indicated function value to three decimal places using 
= x2 - x; y(0) = 0; find y(0.3)
A. -0.055 B. -0.025 C. -0.046 D. -0.034