The picture is a bit blurry but the perimeter of a shape is the lengths added.
(4a - 2b) + (7a + 3) + (9a - 4) = perimeter, I added the sides together
Combine like terms to get:
4a + 7a + 9a = 20a
-2b is left along becuase there are no other like terms
3 - 4 = -1
The perimeter is 20a - 2b - 1
It would be T divided by 5. If Jeffery read a book essentially 1/5 of the size of Toby's book then T divided by 5 would have to be the answer.
350 cm^2 (A for connections academy)
