Question

I need to know what 13r - r =

Answer 1

12r

Explanation:

since r means 1r, do 13-1

Answer 2

12r

Explanation:

`13r-r\\\\\text{'13r' and 'r' are like terms. We will combine them to get our answer.}\\\\13r-r\\\\\boxed{12r}`

Hope this helps.