now you have to find a1 and d. d is like slope, and you can think of the numbers as points, so use something like the slope equation |dw:1435788072594:dw|
so it would be -146 - -58 / 21- 19 = -44
I got -53
oh you used -146 instead of -164
ohhhh ok nvm
ok yea i got -53
then use the a_n formula to solve a_1 |dw:1435788320276:dw|
so it would be -a1=164-53(20)
and then reduce that to get a number for a1
so the answer would be an=896-53(n-1)?
ok thank you so much!