Solve the problem.A contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 5% cement should he mix with 5 bags of 21% cement to produce a mix containing 9% cement?
A. 15 bags
B. 25 bags
C. 17 bags
D. 20 bags
Answer: A
Mathematics
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Determine whether the function is a probability density function over the given interval.f(x) = 
A. No B. Yes
Mathematics
Solve the equation.8n - 6 = 130 - 9n
A. n = -8 B. n = 9 C. n = 7 D. n = 8
Mathematics
Solve the problem.The number N, in millions of Americans of age x with arthritis, is estimated with the following graph.
Give the age(s) at which there are 2 million people with arthritis.
A. 35 and 80 B. 46 C. 45 and 65 D. 46 and 80
Mathematics
Solve the problem.How many ways are there to choose a soccer team consisting of 3 forwards, 4 midfield players, and 3 defensive players, if the players are chosen from 10 forwards, 7 midfield players, and 5 defensive players?
A. 646,646 B. 42,000 C. 36,288,000 D. 165
Mathematics