Simplify.
A. ±7
B. 49
C. 19
D. 7
Answer: D
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Solve the problem.On our moon, the acceleration of gravity is 1.6 m/sec2. If a rock is dropped into a crevasse, how fast will it be going just before it hits bottom 45 seconds later?
A. -36 m/sec B. 3240 m/sec C. 72 m/sec D. -72 m/sec
Find the inverse of the function.f(x) = 
A. f-1(x) = 
B. f-1(x) = 
C. f-1(x) = 
D. Not invertible
Graph the polar equation.r = 
A. 
B. 
C. 
D. 
Write a system of equations to describe the problem situation. Use guess and check to solve the problem.
A boat travels 20 miles downstream in an hour. While its passengers are fishing, the tide comes in. The tidewater reaches 20 miles upstream. The trip home on still water take 
hours. Find the speed of the current, c.
A) c = 1.5 mph
B) c = 2.0 mph
C) c = 2.5 mph
D) c = 3.0 mph
E) c = 4.0 mph