Question

Find an equation for the nth term of the arithmetic sequence.
a19 = -92, a20 = 6

an = -1856 + 98(n - 1)
an = -1856 - 98(n - 1)
an = -1856 - 98(n + 1)
an = -1856 + 98(n + 1)
@dan815 @jim_thompson5910 @mathstudent55 @compassionate @zzr0ck3r

Answer 1

First isolate d

\[\Large a_{19} + d = a_{20}\]

\[\Large -92 + d = 6\]

\[\Large d= ???\]

Answer 2

-86 @jim_thompson5910

Answer 3

then what do we do? @jim_thompson5910

Answer 4

you add 92 to both sides

Answer 5

6+92 = ??

Answer 6

98 @jim_thompson5910

Answer 7

so d = 98

Answer 8

which is why the answer is