Solve the problem.A collection of dimes is arranged in a triangular array with 12 coins in the base row, 11 in the next, 10 in the next, and so on with 1 dime in the last row. Find the value of the collection.
A. $15.60
B. $0.78
C. $3.90
D. $7.80
Answer: D
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Solve the problem.Don runs a charity fruit sale, selling boxes of oranges for $11 and boxes of grapefruit for $10. If he sold a total of 762 boxes and took in $8125 in all, then how many boxes of oranges did he sell?
A. 383 boxes B. 505 boxes C. 257 boxes D. 458 boxes
Solve the problem.Suppose that P(A) = 0.39, P(B) = 0.36, and P(A ? B) = 0.21, find P(A ? B).
A. 0.75 B. 0.33 C. 0.54 D. 0.96
Find the product, if possible. 
A. 
B. 
C. 
D. 
Solve by graphing.The cost y (in hundreds of dollars) of tuition at one community college is given by the linear equation 
where x is the number of credits for which a student registers. Graph the equation and use the graph to estimate the cost of tuition if a student registers for 15 credits. 
A. $2900 B. $2100 C. $3300 D. $2175