Divide. Abbreviate any repeating decimal by placing a bar over the repetend.3.51 ÷ 9
A. 13.9
B. 3.9
C. 1.39
D. 0.39
Answer: D
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Find the center of mass of a thin plate of constant density covering the given region.The region bounded by the parabola x = y2 and the line x = 16
A. 
= 
, 
= 0
B. 
= 16, 
= 0
C. 
= 0, 
= 
D. 
= 
, 
= 0
Solve the problem.The concentration c (in mg/L) of a certain drug in the bloodstream is found to be 
where t is time (in h) after the drug is taken. Find dc/dt.
A. 
B. 
C. 
D. 
Solve the problem.The figure shows two intersections, labeled A and B, that involve one-way streets. The numbers and variables represent the average traffic flow rates measured in vehicles per hour. For example, an average of 600 vehicles per hour enter intersection A from the west, whereas 250 vehicles per hour enter this intersection from the north. A stoplight will control the unknown traffic flow denoted by the variables x and y. Use the fact that the number of vehicles entering an intersection must equal the number leaving to determine x and y.
A. x= 250, y = 150 B. x= 600, y = 500 C. x= 400, y = 450 D. x= 450, y = 400
An earthquake has an amplitude of 8,500 micrometers and a period of 0.05 second. Find its measure on the Richter scale. ? Please enter your answer as a number rounded to one decimal place.
Fill in the blank(s) with the appropriate word(s).