Question

Rectangle LMNP has a length of 3x+5 meters and a width of 4x-3 meters. What is its perimeter? PART B: The perimeter of rectangle QRST is the same as the perimeter of rectangle LMNP. The length of QRST is 2x+9 meters. What is the width of QRST?

Answer 1

Part A: 
(3x+5)+(3x+5)+(4x-3)+(4x-3)=p
3x+3x+4x+4x=14x
5+5+-3+-3=4
14x+4=p
     -4    -4
14x=p-4
----  -----
14    14

x=1/4 p + -2/7

14(1/4 p +-2/7) +4=p
14(0.25p + 0.28571428571)+4=p
3.5 + 3.99999999994 + 4=p
11.4999999999=p

This may not help by no harm in trying.