Sunset gold paint is made by mixing 3 parts yellow to 1 part red. how much red is to be mixed with 2 quarts of yellow?

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm