a square has 2x+3. if a rectangles made up of three of these squares, which expression would represent the perimeter of the rectangle?

The perimeter of the rectangle that contains the 3 squares is 24x + 36 units

Step-by-step explanation:

Here, we have a square with side length 2x + 3

The perimeter of this square would be calculated using the mathematical formula;

P = 4L

P = 4 (2x + 3) = 8x + 12 units

Now, this particular rectangle is composed of three of these squares.

The expression which would represent the perimeter of the rectangle is equal to the sum of the perimeters of the 3 squares.

That would be 8x + 12 + 8x + 12 + 8x + 12 or simply 3 (8x + 12) = 24x + 36