Solve the problem.Two trains leave a train station at the same time. One travels east at 10 miles per hour. The other train travels west at 8 miles per hour. In how many hours will the two trains be 153 miles apart?
A. 8.5 hr
B. 4.3 hr
C. 9 hr
D. 17 hr
Answer: A
Mathematics
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Find the sum of the series.
A. 
B. 
C. 
D. 
Mathematics
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.
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B. None of these.
C.
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D.
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Mathematics
Solve the problem.Twenty random numbers are generated to simulate the outcomes of the sexes of the children in a three-child family. If an even digit simulates a girl and an odd digit a boy, use these results to determine the probability that a family has at most one boy.590506021366063667374153662591685274310673964351774640298961
A. 
B. 
C. 
D. 
Mathematics
Simplify the expression. Assume that all variables represent positive real numbers.
-2
A. 
B. 
C. 
D. 
Mathematics