The perimeter is twice the sum of the length and the width:

The area is the product of the dimensions:

So, the system is

Hi !
The volume of the cube is :
18 × 18 × 18= 5 832 mm³
The answer is D.
First we need to find where the 2 graphs intercept.
x^2 + 3 = - (x^2 - 4x + 4) + 7
x^2 + 3 = -x^2 + 4x + 3
2x^2 - 4x = 0
2x(x - 2)
x = 0 , 2. are x coordinates of the 2 intercepts.
1×5 or 5×1 would be a factual of it