Question

I got it wrong on my quiz, my exam is tomorrow and id like help understanding it.

Answer 1

The perimeter of the sandwich is the sum of all its sides, then we have:

`2x^2+8+2x^2+8+2x^2+9+2x^2+9=8x^2+34`

Therefore the perimeter is:

`8x^2+34`

The length of the crust is the same as the perimeter of the sandwich; if x=1.2 we have that:

`8(1.2)^2+34=45.52`

Therefore the length of the crust is 45.52