Solve the problem.Suppose there are two low-frequency sound waves with similar frequencies. Let 
and 
model the two tones where t is time measured in seconds. Write the sum 
as a product of two trigonometric functions, and determine the frequency of the beats.
A. no beats
0.008 cos (94?t) cos (94?t)
B. 4 beats per second
0.008 cos (94?t) cos (4?t)
C. no beats
0.008 cos (47?t) cos (47?t)
D. 2 beats per second
0.008 cos (47?t) cos(2?t)
Answer: B
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Use L'H
pital's rule to find the limit.
A. -1 B. 10 C. 4 D. 16
Find the function with the given derivative whose graph passes through the point P.g'(x) =
+ 2x , P(-4, 4)
A. g(x) = 
+ x2 - 
B. g(x) = - 
- x2 - 
C. g(x) = - 
+ x2 - 
D. g(x) = 
+ x2 + 
At one high school, students can run the 100-yard dash in an average of 15.2 seconds with a standard deviation of .9 seconds. The times are very closely approximated by a normal curve. Find the percent of times that are indicated. Round to the nearest whole percent.Less than 17 seconds
A. 98% B. 3% C. 98% D. 84%
Find the domain of the rational function.h(x) = 
A. all real numbers B. {x|x ? 0, x ? -64} C. {x|x ? -8, x ? 8, x ? -3} D. {x|x ? -8, x ? 8}