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. 1641
B. 3188
C. 3190
D. 1639
Answer: B
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Find the product.(x + 2y)3
A. 3(x + 2y) B. x3 + 2x2y + 4xy + 4xy2 + 8y2 + 8y3 C. x3 + 8y3 D. x3 + 6x2y + 12xy2 + 8y3
Use the given functions to find all values of x that satisfy the required inequality.f(x) = 
, g(x) = 2; f(x) ? g(x)
A. [-8, -4) B. (-4, 8] C. (-?, -8] ? (-4, ?) D. (-?, -4) ? [0, ?)
Solve the problem.Some people must eat a low-sodium diet with no more than 2,000 mg of sodium per day. By eating 1 cracker, 1 pretzel, and 1 cookie, a person would ingest 149 mg of sodium. If a person ate 8 pretzels and 8 cookies, he or she would ingest 936 mg of sodium. By eating 6 crackers and 7 pretzels, the person would take in 535 mg of sodium. Which of the following is true?
A. A cracker has 30 mg of sodium. B. A cookie has 71 mg of sodium. C. A pretzel has 49 mg of sodium. D. None of these
Express the number in decimal notation.7 × 10-7
A. 0.0000007 B. -700,000 C. 0.00000007 D. 0.000007