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February 1, 2015

February 1, 2015

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

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?

- Math -
**Abbey(Please help)**, Tuesday, May 4, 2010 at 4:39pmWould n be 14?

- Math -
**Reiny**, Tuesday, May 4, 2010 at 4:45pmn/2(26) = 18

26n = 36

n = 36/26

something very wrong with your equation, since n has to a whole number

where does the 18 come from?

you seem to be using the formula

S(n) = n/2(first + last)

so 18 would be the sum of the logs ????

that makes no sense, since the bottom row alone contains 21 logs.

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