Solve.Jan swims at a speed of 5.2 mph in still water. The river she's in flows at a speed of 3.1 mph. How long will it take Jan to swim 2.5 mi downstream? Round your answer to the nearest tenth of an hour, if necessary.
A. 0.3 hr
B. 20.8 hr
C. 3.3 hr
D. 1.2 hr
Answer: A
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Solve.The approach ramp used by a daredevil motorcyclist for flying over a collection of flaming tires has a rise of 45 feet for every 90 feet in horizontal distance. Find the grade of the ramp. Round to the nearest whole percent.
A. 55% B. 0.5% C. 20% D. 50%
Perform the indicated operation.(3x2 - xy - y2) + (x2 + 5xy + 6y2)
A. 4x2 + 6xy + 7y2 B. 2x2 - 6xy - 7y2 C. 4x2 + 4xy + 5y2 D. 3x2 + 5xy + 6y2
Perform the indicated operation and reduce to lowest terms.
- 
A. 
B. 
C. 
D. 
Solve the problem.A company installs 5000 light bulbs. Each bulb has an average life of 500 hours with a standard deviation of 100 hours. The life of each bulb is approximated by a normal curve. Find the number of bulbs that can be expected to last less than 500 hours.
A. 2500 B. 3000 C. 2400 D. 1000