Solve. Round to the nearest percent if necessary.Enrollment in a class at a local college increased from 140 to 168. What was the percent of increase?
A. 17%
B. 20%
C. 120%
D. 28%
Answer: B
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Use the graph to evaluate the limit.
f(x)
A. -2 B. does not exist C. 0 D. 1
The figures are similar. Find the length of the side marked x.
A. 24.5 B. 40 C. 14.4 D. 22.5
Solve the problem.Find the center of mass of the region of density 
bounded by the paraboloid 
and the xy-plane.
A. 
= 0, 
= 0, 
= 4
B. 
= 0, 
= 0, 
= 
C. 
= 0, 
= 0, 
= 8
D. 
= 0, 
= 0, 
= 
In order to determine the effects of a new pill that is supposed to reduce hair loss, a researcher conducts a study. Five hundred volunteer subjects (300 men and 200 women) all of which suffer some degree of hair loss are selected to participate in the study. The researcher gives the women the real pill and the men a sugar pill, but only the researcher knows this.In the experiment, which is the placebo group?
A. the 200 women B. the 300 men C. the subjects that responded to the treatment D. There is no placebo group. E. none of these