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July 30, 2015

Homework Help: Math

Posted by Abbey(Please help) on Tuesday, May 4, 2010 at 4:37pm.

Logs are stacked up in apile as shown in the figure. The top row has 15 logs and the bottom row has 21 logs. How many logs are in the stack?

a1= 1+14=15
an= 7+14=21
s1=(n/2)(a1+an)

(n/2)(15+21) = 18

How do I figure out the n?

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