2w+5 = L (length)The formula for finding out the perimeter is 2w + 2l, right?I think all you have to do is substitute 2w+5 for L, and plug in the perimeter:2w + 2(2w+5) = 342w+4w+10 = 346w+10 = 346w = 24w = 4There, you have the width! :DFrom this information I think you can work out the rest. Good luck! :D