Solve.Two cars leave a parking lot and travel in opposite directions. One travels at 10 miles per hour and the other travels at 7 miles per hour. In how many hours will the two cars be 68 miles apart?
A. 12 hr.
B. 8 hr.
C. 9 hr.
D. 4 hr.
Answer: D
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Find the derivative of y with respect to x, t, or ?, as appropriate.y = ln 
A. ln 
B. 
C. 
D. 
Maximize
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subject to
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Round all answers to two decimal places.
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B. 
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D. 
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Sketch the subset on the real number line, and state whether the inequality is bounded or unbounded. ? x ? -2 ?
A. 
The interval is unbounded.
B.
The interval is unbounded.
C.
The interval is bounded.
D.
The interval is bounded.
E.
The interval is unbounded.
Solve the problem by estimating.The following table shows the number of Mega-Box stores in selected states. Estimate the total number of Mega-Box stores in these states by rounding each value to the nearest ten. 
A. 221 stores B. 220 stores C. 200 stores D. 230 stores