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.

## Answer This Question

## Related Questions

- Math Formula--General Term - Consider the sequence 12, 5, -2, -9 Determine the ...
- Math - Write a formula for the general term (the nth term) of the arithmetic ...
- Math - The first prize in a lottery is $250 000. Each winner chosen after the ...
- algebta 2 - To find the nth term of an arithmetic sequence the formula given is ...
- algebra - Could someone check my work; 1. Generate the first five terms in the ...
- Sequences - Show full steps: 1a) Determine the formula for the nth term for 7,12...
- Math binomial formula and sequence - a) use the binomial formula to find the 5th...
- math - 51.A sequence t is defined where the first term is –4. Each successive ...
- math30 - A sequence has a first term of 24 and every other term is one half of ...
- chemistry - A compound has the following composition. C 54.5%, H 9.10% and 0 36....

More Related Questions