A company installs 5,000 light bulbs. The lifetimes of the lightbulbs are approximately normally distributed with a mean of 500 hours and a standard deviation of 100 hours. Find the approximate number of bulbs that can be expected to last the indicated amount of time.More than 400 hours
A. 4,195
B. 4,219
C. 4,205
D. 2,207
Answer: C
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Solve.Andrea's sleeping bag is designed for camping in temperatures of -3°C or warmer. For what Fahrenheit temperatures is her sleeping bag designed? Round to the nearest tenth.
A. -33.7°F or warmer B. -19.4°F or warmer C. 52.2°F or warmer D. 26.6°F or warmer
Solve the problem.There are two types of tickets for a school play: tickets for children under 11 and adult tickets. The total cost for one child's ticket and one adult's ticket is 
The total cost for 9 children's tickets and 8 adult tickets is 
How much does an adult ticket cost?
A. $6 B. $7 C. $9 D. $2
For the compound inequality, give the solution set in both interval and graph forms.x - 2 > 2 or x + 3 < 1
A. (-?, -2) ? (4, ?)
B. (-2, ?)
C. (-?, 2) ? (4, ?)
D. (-?, 4)
Factor by grouping.10x4 + 15x2 - 6x2 - 9
A. (5x2 + 3)(2x2 - 3) B. (5x4 - 3)(2x + 3) C. (5x2 - 3)(2x2 + 3) D. (10x2 + 3)(x2 - 3)