Perimeter = 2(length) + 2(width) <-- this is the general formula
..in terms of writing it as an inequality where it is at most 104 units
104 ≥ 2L + 2(5) **I just have length be L**
104 ≥ 2L + 10
If you solve for the length
104 - 10 ≥ 2L + 10 - 10
94 ≥ 2L
94 / 2 ≥ 2L / 2
47 ≥ L
