Question

Find the 57th term of the arithmetic sequence -13,-29,-45,…

Answer 1

hi,

-909

Explanation:

Formula to use:
`a_(n+1)=a_1+n*r`

First term=-13

Commun difference=
`a_2-a_1`

`a_1=-13\\r=-29-(-13)=-16\\\\\\a_(57)=a_1+(57-1)*r=-13+56*(-16)=-909\\`