Perform the operation indicated.
÷ 
A. x + 9
B. 
C. 
D. 
Answer: C
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Sketch D and g(D) from the description of D and change of variables 
x = u2 - v2, y = 2uv where D is the rectangle 0 ? u ? 1, 0 ? v ? 1
A.
 ? |  |
B.
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C. None of these.
D.
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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.Greater than 16.1 seconds
A. 16% B. 14% C. 2% D. 15%
Simplify the expression. If any variables are present, assume that they are positive.
A. y2
B. y2
C. y
D. y2
Solve the problem.A cyclist bikes at a constant speed for 19 miles. He then returns home at the same speed but takes a different route. His return trip takes one hour longer and is 24 miles. Find his speed.
A. 6 mph B. 4 mph C. 5 mph D. 7 mph