Solve the equation for x.
= 4
A. {2}
B. {-2}
C. {4}
D. ?
Answer: B
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Solve the problem.The amount of alcohol in the bloodstream, A, declines at a rate proportional to the amount, that is, 
. If 
for a particular person, how long will it take for his alcohol concentration to decrease from 0.10% to 0.05%? Give your answer to the nearest tenth of an hour.
A. 1.7 hr B. 0.4 hr C. 2.3 hr D. 1.2 hr
Translate the problem situation to a system of equations. Do not attempt to solve.The perimeter of a rectangular building is 246 feet. The width is 57 feet shorter than the length. What are the dimensions? (Let W represent the width and L represent the length.)
A. W = L + 57, 2L + 2W = 246 B. L = W - 57, 2L + W = 246 C. W = L - 57, 2L + 2W = 246 D. W = L - 57, L + W = 246
Use the properties of parallel lines to solve the problem.
is parallel to 
. Find the measure of each numbered angle.
A. ?2 ? ?3, both are 69°; ?1 ? ?ABE, both are 111°. B. ?1 ? ?2, both are 111°; ?3 ? ?ABE, both are 69°. C. ?1 ? ?2, both are 69°; ?3 ? ?ABE, both are 111°. D. ?1 ? ?3, both are 69°; ?2 ? ?ABE, both are 111°.
Solve the problem.The number of students infected with the flu on a college campus after t days is modeled by the function 
What was the initial number of infected students?
A. 30 students B. 39 students C. 600 students D. 15 students