Question

How do you fill in the blank for the expression `r^?*r^12=r^20`?

Answer 1

`r^?=r^8`

Explanation:

Apply the exponent rule `x^a/x^b=x^(a-b)` .

`r^?=r^20/r^12=`

`r^?=r^((20-12))=r^8`