Final answer:
The linear expression that represents the length of the string in feet is L - S. When x = 4, the length of the string is 4 - S.
Step-by-step explanation:
To find the linear expression that represents the length of the string in feet, we need to consider the perimeter of the patio minus the length of the side with the steps. Let's say the length of the patio is represented by variable L and the length of the side with the steps is represented by variable S. The linear expression would be:
L - S
To find the length of the string when x = 4, we substitute x into the expression:
4 - S
Since the length of the side with the steps is not specified in the question, we can't determine the exact length of the string. We can only express it as
4 - S