Question

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!

Answer 1

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)

Answer 2

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

Answer 3

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

Answer 4

correct

Answer 5

What is that formula called? @jim_thompson5910

Answer 6

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

Answer 7

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

Answer 8

you're welcome