Posted by **Anonymous** on Tuesday, September 13, 2011 at 10:44pm.

I've done the second part to the Math Formula post. It was determine the 19th term of the sequence which I did.

Now it says..which of the numbers -268 and -350 are terms of the sequence?

I was doing something like this:

tn = -7 (-268) +19

I was plugging -268 as n. But that just confused me. How do I figure this out?

- Math Formula Part 2/3 -
**Reiny**, Wednesday, September 14, 2011 at 8:45am
No, you are trying to find n.

Phrased another way:

Which term in the sequence is equal to -268

let that term number be n

remember tn = a + (n-1)d

from your previous post

a =

d =

-268 = 12 + (n-1)(-7)

-280 = -7n + 7

-287 = -7n

n = 41

so the t41 = -268

Do the same thing for tn = 350

remember , that n has to be a positive whole number, or else there is not such term.

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