Perform the division of monomials 12x³/4x​

3x^2

because 12x^3/4x = 3x^3/x and when its x^3/x^1 , the exponents can cancel out until one of the variables is gone, so x^3 becomes x^2 and x^1 is gone!

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