to find the perimeter of the rectangle this is the expression:
x-9+x-9+3x-4+3x-4=138
if we simplify it:
8x-26=138
remember, 138 is what it all adds up to
the length is 11.5cm
the width is 57.5cm
the area is 661.25cm^2
the answers might not be correct use at own risk