Problem
6) What is the missing exponent in the equation below? \[ \frac{7^{8}}{7^{10}}=7^{x} \] (A) -2 (B) 2 (C) 18 (D) -18
Solution
Step 1 ：\[\frac{7^8}{7^{10}}=7^{8-10}\]
Step 2 ：\[7^{8-10}=7^{-2}\]
Step 3 ：\[x=-2\]
Step 1 ：\[\frac{7^8}{7^{10}}=7^{8-10}\]
Step 2 ：\[7^{8-10}=7^{-2}\]
Step 3 ：\[x=-2\]
