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.At least 500 hours
A. 5,000
B. 1,000
C. 2,500
D. 2,400
Answer: C
Mathematics
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By calculating an appropriate number of terms, determine if the series converges or diverges. If it converges, find the limit L and the smallest integer N such that 
for 
otherwise indicate divergence.an = 
A. L = 0, N = 13 B. L = 0, N = 10 C. L = 0, N = 8 D. diverges
Mathematics
Write the expression in the standard form a + bi.
A. -1 + 2i B. -1 - 2i C. 1 + 2i D. -1 + 5i
Mathematics
Solve using the addition principle.y - 1.8 = 2.7
A. -4.5 B. 0.9 C. 4.5 D. 4.86
Mathematics
Find the area.
A. 18 ft2 B. 15 ft2 C. 36 ft2 D. 16 ft2
Mathematics