Answer:

Step-by-step explanation:
We have that:

Now we can find a+b

1 would be B. 2 would be a
2(4x-3)-7(x+1) first distribute
8x-6-7x+7 then combine the x's
<u>x+13 </u>
top middle, square, and right triangle. to find perimeter you simply add all of the side lengths :)