Translate to a system of two equations, then solve.How many liters of a 30% alcohol solution must be mixed with 40 liters of a 70% solution to get a 50% solution?
A. 8 L
B. 4 L
C. 80 L
D. 40 L
Answer: D
Mathematics
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Evaluate the integral.
A. 17?
B. 34?
C. 51?
D. 
?
Mathematics
Solve.The sum of one-half a number, one-third of the number, and one-twelfth of the number is 55. Find the original number.
A. 5 B. 66 C. 50 D. 60
Mathematics
Solve the inequality.
+ 2 > 5
A. (-?, -3) B. (-?, -3) ? (3, ?) C. (-?, -5) ? (5, ?) D. ?
Mathematics
For the given functions f and g, find the requested composite function value.f(x) = 
, g(x) = 10x - 7;
Find (f ? g)(12).
A. 152,776 B. 16,793 C. 189,840 D. 135,983
Mathematics