His mistake was in multiplying the 3 with the 12. He should have divided it from the 12 because that would have gotten rid of the 3 with the variable. It would also lead to the correct answer, which is b=4
Answer:
Commutative
Step-by-step explanation:
Given

Required
What law is applied
The applied law is commutative law of addition.
This law states that:

So:

When the positions of 2 and b are interchanged, we have:

Remove bracket

Answer:
Step-by-step explanation:
The area of the equilateral triangle is 
hey the answer is y=1.862x−0.138 just took the test!