Can someone ? i don’t understand this.

PS = 28 units.

Step-by-step explanation:

See the attached diagram.

This is a figure of rectangle with length (3y + 3) and width 4y.

Now, the perimeter of the rectangle is 2[(3y + 3) + 4y] = 2(7y + 3)

The perimeter of the rectangle is given to be 104 units.

So, 2(7y + 3) = 104

⇒ 7y + 3 = 52

⇒ 7y = 49

⇒ y = 7

Therefore, PS = 4y = 4(7) = 28 units. (Answer)