Question

How do you find the term n=13, given `a_1=-5` and d=7?

Answer 1

`a_(13)=79`

Explanation:

For an `color(blue)"arithmetic sequence"` the nth term is found by using the nth term formula.

`color(orange)"Reminder " color(red)(bar(ul(|color(white)(2/2)color(black)(a_n=a_1+(n-1)d)color(white)(2/2)|)))`

`rArr a_(13)=-5+(12xx7)`

`color(white)(rArra_(13))=-5+84`

`color(white)(rArra_(13))=79`