Answer:

Step-by-step explanation:
This is the associative property of addition. It states that no matter where you switch the numbers in an equation full of addition symbols, the answer will remain the same.

The equivalent expression is ~


Answer:
EF=3.6
Step-by-step explanation:
I'm going to use Pythagorean Theorem for side EF.
4.8^2+EF^2=6^2
23.04+EF^2=36
-23.04 -23.04
EF^2=12.96
sqrt sqrt
EF=3.6