Answer:
x - 13
Explanation:
- We can represent what we're given with x - 13, as we do not know what the length of the rectangle is, but we know that x is 13 less than the length.
- If we plugged in a number to represent the length, we would be correct every time.
If I am incorrect in my reasoning, please let me know so that I can plan better for my future answers. Have an amazing day.