Solve the problem.The amount of Jen's monthly phone bill is normally distributed with a mean of $69 and a standard deviation of $9. What percentage of her phone bills are between $69 and $78?
A. 68%
B. 95%
C. 47.5%
D. 34%
Answer: D
Mathematics
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Find the greatest common factor of the terms.21m4, 189m9
A. 189m4 B. 3969m5 C. 21m4 D. 21m5
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Simplify.
A. 
B. None of these
C. 
D. -1
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Solve the exponential equation and approximate the result, correct to three decimal places.2(5x - 2) = 15
A. 1.181 B. 0.803 C. 0.381 D. 1.900
Mathematics
Simplify the expression by combining any like terms.-5m + 2 - 1 + 6 + m - 7
A. -4m - 1 B. -4m C. -6m + 1 D. -6m
Mathematics