Solve the problem.Suppose that two cars, both traveling at a constant speed of 60 miles per hour, approach each other on a straight highway. Initially they are 12 miles apart. Let x represent minutes. Give an absolute value equation whose solution gives the times when the cars are more than 8 miles apart. Solve the equation. Interpret the meaning of the result.
A. 
> 8; x < 2 or x > 10; Before 2 minutes or after 10 minutes the cars are more than 8 miles apart.
B. 
< -12; No solution; The cars will never be more than 8 miles apart.
C. 
> 4; -2 < x < 2; After 2 minutes or 2 minutes earlier the cars are more than 8 miles apart.
D. 
> 8; x < 4 or x > 20; Before 4 minutes or after 20 minutes the cars are more than 8 miles apart.
Answer: A
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- 2
A. 
B. 
C. 
D. 
Find absolute maximum and minimum values of the function, if they exist, over the indicated interval. Where no interval is specified, use the real line. List your answers in terms of ordered pairs.
f (x) = ?x2 + 2.6x ? 5
The DeWitt Company has found that the rate of change of its average cost of producing a product is 
, where x is the number of units and cost is in dollars. The average cost of producing 20 units is $40.00. Find the average cost of producing 140 units of the product. Round to the nearest dollar.
?
A. $46 B. $48 C. $51 D. $53 E. $58