Why is it important to have the variable
only
on one side of an equation

The doghouse shown has a floor, but no windows. find the total surface area of the doghouse, including the door.

Which of the following points is collinear with (-2,1) and (0,3)

The lengths of all sides of a triangle are integers when measured in decimeters. one of the sides has length of 1 dm and another of 3 dm. find the perimeter of the triangle.'