Question

The 2 in the middle is the one that I needed help
Please

Answer 1

The equation is p=34a+12, and a=7

Explanation:

Perimeter is all of the sides added together

p=12a+6a+8+6a+8+10a-4

Combine like-terms

p=34a+12

Solve for a by making p equal to 250

250=34a+12

Subtract 12 from both sides

238=34a

Divide both sides by 34

7=a