The short sides of a rectangle are 2 inches. the long sides of the same rectangle are three less than a certain number of inches. write an expression, in simplest form, to represent the perimeter of this rectangle.

So the “certain number” will be S.
Since 2width + 2length, the first part would be 2 times 2 which is 4
The length is S - 3
We then have to multiply this by 2
So it is 2(S-3) which is 2S-6
So the answer is 4+2S-6 which is 2S-2