Final answer:
To find the perimeter of a rectangle with given width and length, we need to add up all the sides.
Step-by-step explanation:
To find the perimeter of a rectangle, we need to add up all the sides. In this case, we have two sides for the length and two sides for the width. Let's calculate:
Length: 2.5x + 10
Width: 4x - 2.5
Perimeter = 2(Length) + 2(Width)
Perimeter = 2(2.5x + 10) + 2(4x - 2.5)
Perimeter = 5x + 20 + 8x - 5
Perimeter = 13x + 15
Therefore, the perimeter of the rectangle is 13x + 15 feet.