Homework Help: PreCal

Posted by Scott on Tuesday, December 18, 2007 at 6:33am.

Write a formula for the general term(the nth term)of the arithmetic sequence. Do not use a recursion formula. Then use the formula for a(n) to find the indicated term of the sequence Find a(11); 12, 10, 8, ...

I came up with -10 ?

PreCal - drwls, Tuesday, December 18, 2007 at 8:06am
a = 12 - 2(n-1) = 14 - 2n
The n=1 term is 12 and each successive term decreases by 2.
Plug in n=11 and see what you get. I get -8.
12, 10, 8, 6, 4, 2, 0, -2, -4, -6, -8

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