Divide.
A. 1650
B. 175
C. 165
D. 158
Answer: C
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Solve. Give your answer as a mixed number if appropriate.
= 
A. 138
B. 2
C. 21
D. 28
Solve.The manager of a coffee shop has one type of coffee that sells for $6 per pound and another type that sells for $12 per pound. The manager wishes to mix 40 pounds of the $12 coffee to get a mixture that will sell for $7 per pound. How many pounds of the $6 coffee should be used?
A. 100 pounds B. 200 pounds C. 240 pounds D. 120 pounds
Solve the problem.The time between major earthquakes in a particular region of the Mediterranean is a random variable with probability density function f(x) = 
e-x/1700 for x in [0, ?), where t is measured in days. Find the expected value and the standard deviation of this probability density function.
A. ? = 1700 days; ? = 1700 days B. ? = 1700 days; ? = 2403.8 days C. ? = 1700 days; ? = 3400 days D. ? = 3400 days; ? = 2403.8 days
Solve the equation.
= 4 - 6
A. 20 B. -40 C. -10 D. 50