Solve the problem.A boat can go 20 mph in still water. It takes as long to go 140 miles upstream as it does to go downstream 210 miles. How fast is the current?
A. 4 mph
B. 3 mph
C. 1 mph
D. 7 mph
Answer: A
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Suppose you have the following project digraph. (The numbers in parentheses represent hours.)
Using the decreasing-time algorithm to schedule this project with two processors results in a finishing time of
A. 22 hours. B. 21 hours. C. 24 hours. D. 26 hours. E. none of these
Simplify the exponential expression. Write any negative exponents as positive exponents. Assume all variables represent positive real numbers.(9x1/3y1/3)2
A. 81x2y2 B. 81x1/6y1/6 C. 81x2/3y2/3 D. 81x1/9y1/9
Identify the figure as a line, line segment, or ray and name it using the appropriate symbol.
A. Ray named 
B. Line named 
C. Ray named 
or 
D. Line named 
or 
Graph the system of inequalities. Indicate the solution set by shading.2x + 3y ? 6 x - y ? 3 x ? 1
A. 
B. 
C. 
D. 