SOLUTION: a grocery store clerk is stacking soup cans. The bottom row has 21 cans. each additional row has 2 fewer soup cans than the previous row. if there are 8 rows, how many soup cans wi

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Question 849428: a grocery store clerk is stacking soup cans. The bottom row has 21 cans. each additional row has 2 fewer soup cans than the previous row. if there are 8 rows, how many soup cans will the clerk have to stack?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
S = ½(2(21) + -2(7))8
S = 112
a = 21 + (8-1)-2
a=21-2*7
last row will have 7