anonymous one year ago PLEASE HELP ME IM STUCK ON THIS PRE CALC QUESTION??? PLEASE HELP ME FINISH MY WORK! Find an equation for the nth term of the arithmetic sequence. -20, -16, -12, -8, ... Here is what i have so far: d=4 a1=-20 c=a1-d c=-24 an=dn+c an=4n-24 What are my next steps? Please help!

1. anonymous

These are my answer choices A. an = -20 x 4(n - 1) B. an = -20 + 4(n - 1) C. an = -20 + 4(n + 2) D. an = -20 + 4(n + 1)

2. jim_thompson5910

$\Large \text{nth term} = (\text{first term}) + (\text{common difference})(n-1)$ $\Large a_n = a_1 + d(n-1)$

3. anonymous

So, an= -20 + 4(n-1)?

4. jim_thompson5910

correct

5. anonymous

What is that formula called? @jim_thompson5910

6. jim_thompson5910

I'm not sure of the specific name, but you can consider it the nth term of the arithmetic sequence formula

7. anonymous

Alright, thank you very much. I did not have that in my notes. Thanks! @jim_thompson5910

8. jim_thompson5910

you're welcome