SOLUTION: iii) The length of a rectangle is 3 cm greater than its width. Obtain an expression for the perimeter of the rectangle by assuming the length to be x. Use the expression to calcula

Algebra ->  Rectangles -> SOLUTION: iii) The length of a rectangle is 3 cm greater than its width. Obtain an expression for the perimeter of the rectangle by assuming the length to be x. Use the expression to calcula      Log On


   

Question 921264: iii) The length of a rectangle is 3 cm greater than its width. Obtain an expression for the perimeter of the rectangle by assuming the length to be x. Use the expression to calculate the length and the width of a rectangle whose perimeter is 30 cm.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

     .

P = 2L + 2w

 2x + 2(x-3) = 30cm

4x = 36

x = 9cm, the length  and width = 6cm

And checking...

P = 2L + 2w

 18cm + 12cm = 30cm