Answer:
A
Step-by-step explanation:
Using the rule of exponents
×
⇔
, thus
Given
×
=
, that is
= 
Since the bases are the same equate the exponents
4 + m = 8 ( subtract 4 from both sides )
m = 4 → A
Answer:
-2
Step-by-step explanation:
10-8=2
8-6=2
6-4=2
4-2=2