Question

Giving medel!

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

Answer 1

how many units do you have to go to get from -5 to 13?

Answer 2

+18

Answer 3

oh, wait, first term is -5, tenth is 13

Answer 4

so if you went, -5, -3, -1, 1, 3, 5, 7, 9, 11, 13, this will give you 13 as your tenth term

Answer 5

so what's the common difference?

Answer 6

2

Answer 7

yup, good job

Answer 8

You want to divide the difference between the final term and the starting term by the difference of the term numbers.
\[\frac{13-(-5)}{10-1} = \frac{18}{9} = 2\]

Answer 9

cool @whpalmer4