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 740 hours
A. 49
B. 40
C. 499
D. 4960
Answer: B
Mathematics
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Solve the problem.The cost of manufacturing clocks is given by C(x) = 56 + 31x - x2. Also, it is known that in t hours the number of clocks that can be produced is given by x = 12t, where 
Express C as a function of t.
A. C(t) = 56 + 372t - 144t2 B. C(t) = 56 + 372t - 144t C. C(t) = 56 + 31t + t2 D. C(t) = 56 + 31t - 12
Mathematics
Graph the system of inequalities, and find the coordinates of the vertices.6y - x ? 8,-y + 3x ? 6,x ? 0
A. 
B. 
C. 
D. 
Mathematics
Solve and check the equation.(x + 3)3/2 = 216
A. {3}
B. {33}
C. 
D. {39}
Mathematics
Solve the inequality and graph the solution set.
< 0
A. ?
B. (-7, 7)
C. (-?, 7)
D. (-7, ?)
Mathematics