SOLUTION: A collection of dimes is arranged in a triangular array with 18 coins in the base row, 17 in the next, 16 in the next, and so forth. Find the value of the collection. I am

Question 379627: A collection of dimes is arranged in a triangular array with 18 coins in the base row, 17 in the next, 16 in the next, and so forth. Find the value of the collection.

I am looking through my text and cannot find an explanation anywere, I appreciate the help
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
Find the sum of the arithmetic sequence and multiply it by .10
S[18]=18/2(1+18)
=9*19
=171
=$17.10
.
Ed
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