posted by susie .
A rectangle has sides of 3x – 4 and 7x + 10. Find the expression that represents its perimeter.
that is my answer please help
You just added two sides, a rectangle has four sides. So the perimeter should be twice what you calculated. However, you have several errors.
So you should have gotten 10x-6, however, that needs to be doubled (you only added two sides).