Pre calc

Pre calc

Postby Guest » Wed Sep 13, 2017 7:46 pm

The sum of eight consecutive natural numbers, the first of which is n. Any help with this problem?





Guest
 

Re: Pre calc

Postby Guest » Thu Sep 14, 2017 12:18 am

It is a geometric progression.

Guest
 

Re: Pre calc

Postby Guest » Thu Sep 14, 2017 6:21 am

n + (n+1) + (n+2) + (n+3) + (n+4) + (n+5) + (n+6) + (n+7) + (n+8) = 9n + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 = 9n + 36

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