You can put this solution on YOUR website! "If the perimeter of a rectangle is 15 cm and its width is 3.5 cm. What is the length of the rectangle in cm?"
Perimeter of a rectangle is 2(width) + 2(length)
x = length
2(3.5) + 2x = 15 {perimeter is 2(width) + 2(length)}
7 + 2x = 15 {multiplied 2 by 3.5}
2x = 8 {subtracted 7 from both sides}
x = 4 {divided both sides by 2}
