Solve the problem.A boat goes 640 miles downstream in the same time it can go 560 miles upstream. The speed of the current is 4 miles per hour. Find the speed of the boat in still water.
A. 60 mph
B. 56 mph
C. 120 mph
D. 64 mph
Answer: A
Mathematics
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and 
for the following function. Rationalize the numerator when necessary.f(x) = - 
A. 
; 
B. 
; 
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; 
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; - 
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