Question

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

Answer 1

Hello,

$u_{1} =-5\\ u_{2} =-5+d\\ u_{3} =-5+2d\\ u_{4} =-5+3d\\ ...\\ u_{10} =-5+9d=13\\ ==\ \textgreater \ 9d=18 \\ ==\ \textgreater \ d=2$