Solve.A boat moves 28 km/h in still water. It travels 80 km upstream and 80 km downstream in a total time of 7 hours. What is the speed of the current?
A. 12 km/h
B. 8 km/h
C. 9 km/h
D. 10 km/h
Answer: A
Mathematics
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Evaluate the expression.
1/2
A. 
B. not a real number
C. 
D. 
Mathematics
Rationalize the denominator. If any variables are present, assume that they represent nonnegative numbers, and assume that the denominator is not zero.
A. 
B. 
C. 
D. 
Mathematics
Rationalize the denominator and simplify. Assume all variables represent nonnegative real numbers.
A. 1
B. 11
C. 
D. 11
Mathematics
Find the product.(-5x - 10y)(-4x - 4y)
A. 20x2 + 20xy + 40y2 B. 20x2 + 60xy + 60y2 C. 20x2 + 40xy + 40y2 D. 20x2 + 60xy + 40y2
Mathematics