Answer:
x(60 - 2x) ≥ 440
Explanation:
Let the wall of Philip's house is along the width of the rectangular dog run.
Let us assume that the length is L and the width is W.
Then given that
2L + W = 60 .......... (1)
Now, again, it is given that LW ≥ 440
⇒ L(60 - 2L) ≥ 440
⇒ x(60 - 2x) ≥ 440 {Where L = x}
Therefore, this is the inequality that can be solved to find x, the length in feet of the dog run. (Answer)