Question

Find an equation for the nth term of the arithmetic sequence.

a18 = 97, a20 = 281

Answer 1

arithmetic sequence meaning that its increasing by a certain number

so first determine what number its increasing by

a20-a18/(20-18)

then determine what a0 is

then write in terms of
an=a0 + n (increasing number)

Answer 2

1st, insert the value like just now
u'll get 2 equations like these :-

97 = a + 17d
281 = a + 19d

then use simultenous equation :)

Answer 3

an = -1467 - 92(n + 1)

an = -1467 + 92(n + 1)

an = -1467 + 92(n - 1)

an = -1467 + 92(n - 2)

These are my choices. I put the third one, but I'm not sure if it's right or not.
I learned all of this last year, but I completely forgot my lessons.

Answer 4

u can find d 1st by eliminating a, then find a,
after obtaining both value, insert it in general formula ...
wait, lemme try :)

Answer 5

yeap, third 1

Answer 6

Yay :) Thanks, honey!

Answer 7

no problem :D