Find the inverse of the function.f(x) = 
- 8 for x ? 0
A. f-1(x) = -(x + 8)2
B. f-1(x) = x + 8
C. f-1(x) = (x + 8)2
D. f-1(x) = (x - 8)2
Answer: C
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Solve the problem. Use 3.14 for ?, if necessary.Find the area of the circular racetrack.(Round to the nearest foot.) r = 90 ft R = 150 ft 
A. 45,216 ft2 B. 25,434 ft2 C. 70,650 ft2 D. 45,216 ft2
Express the number in standard notation.6.249 × 104
A. 249.96 B. 6249 C. 624,900 D. 62,490
Find the standard deviation. Round to the nearest tenth.3, 3, 11, 9, 17, 15, 14, 10, 14
A. 1.3 B. 5.4 C. 4.7 D. 5.0
Solve the problem.The average speed on a round-trip commute having a one-way distance d is given by the complex rational expression 
in which r1 and r2 are the speeds on the outgoing and return trips, respectively. Fred and Mischa both drove to campus averaging 40 miles per hour and each returned home on the same route he used going and averaged 45 miles per hour. Fred's one-way route was 7 miles longer than Mischa's. Simplify the complex rational expression and answer the question: How does Fred's overall average speed compare with Mischa's?
A. Fred's average speed is lower than Mischa's. B. Fred's average speed is higher than Mischa's. C. Fred's average speed is the same as Mischa's. D. Not enough information is given to answer the question.