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 between 290 hours and 540 hours.
A. 3190
B. 1641
C. 3188
D. 1639
Answer: C
Mathematics
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Find the first term of the arithmetic sequence with a common difference of 5 and whose 59th term is 281.
A. 4 B. 13 C. - 9 D. - 7
Mathematics
Write the set by listing its elements.The set of whole numbers greater than 5 and less than 9.
A. {5, 6, 7, 8} B. {5, 6, 7, 8, 9} C. {6, 7, 8, 9} D. {6, 7, 8}
Mathematics
Test the equation for symmetry with respect to the specified axis, line, or pole.r = 4 - 4 cos ?; the y-axis 
A. Symmetric about the y-axis B. May or may not be symmetric about the line y-axis
Mathematics
Factor completely.x2 - x - 40
A. (x - 5)(x + 8) B. (x + 5)(x - 8) C. (x - 40)(x + 1) D. Prime
Mathematics