Evaluate the expression.
A. -30
B. -52
C. 180
D. 52
E. 34
Answer: C
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Solve the problem. Round amounts of money to the nearest cent.To raise money, the Boy Scouts bought 90 kg of caramels for $295.20. They sold the caramels in 100 g bags for $0.76 each. How much profit did they make?
A. $388.80 B. $194.40 C. $432.00 D. $68.40
Solve the problem.In the weighted voting system 
, the smallest possible value that the quota q can take is
A. 46. B. 23. C. 22. D. 31. E. none of these
Solve the problem.The half-life of a certain radioactive substance is 5 years. Suppose that at time 
there are 28 g of the substance. Then after t years, the number of grams of the substance remaining will be N(t) = 28
t/10How many grams of the substance will remain after 45 years?Round to the nearest hundredth of a gram.
A. 1.24 g B. 0.15 g C. 0.62 g D. 0.31 g
Solve the system of equations by using substitution. 
A. x = 1, y = 0 B. x = 0, y = 1 C. x = 1, y = 1 D. x = 0, y = 0