Question

The first term of an arithmetic sequence is -5, and the tenth term is 13. Find the common difference.

Answer 1

When you have the first term, \(\large a_1\) and an nth term \(\large a_n\)
The common difference \(\large d\) is given by
\[\Large d = \frac{a_n-a_1}{n-1}\]

Answer 2

So, you just have n = 13, and the rest follows :P

Answer 3

WAIT NO!!!!

Answer 4

Miss read it, I meant n = 10
whoops (since 13 is the tenth term)