Simplify. 63 ÷ 9 - 7
A. 108
B. 17
C. 214
D. 27
Answer: B
Mathematics
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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
Mathematics
Solve the equation. Simplify. If the solution is an improper fraction, write it as a mixed number.
p = 1
A. p = 6
B. p = 7
C. p = 5
D. p = 4
Mathematics
Find the indicated root.
A. not a real number
B. 11
C. 
D. -11
Mathematics
Multiply or divide and simplify your answer.13 ÷ 3
A. 2
B. 5
C. 4
D. 3
Mathematics