Solve the problem.A boat can go 21 mph in still water. It takes as long to go 180 miles upstream as it does to go downstream 240 miles. How fast is the current?
A. 6 mph
B. 1 mph
C. 3 mph
D. 2 mph
Answer: C
Mathematics
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Make an analysis using calculus and sketch the graph.F(x) = 
A. 
B. 
C. 
D. 
Mathematics
Solve the equation.6r + 6 = 30
A. 22 B. 4 C. 18 D. 1
Mathematics
Use the rules for exponents to rewrite the expression and then evaluate the new expression. (72)-1
A. 
B. - 
C. -14
D. -49
Mathematics
Find the sum.1 + 3 + 5 + ... + 1575
A. 621,732 B. 622,521 C. 620,944 D. 619,369
Mathematics