Answer:
C
Step-by-step explanation:
The general functional notation is:

Where it means that
is a function of
, and the answer is
.
From the problem, we know that the depth is a function of distance, and at that specific distance, the depth is 30 ft.
<u>So we see that </u><u>depth </u><u>is a function of </u><u>distance from shore</u><u>, and the answer is </u><u>30 ft.</u>
Matching this to our explanation of functional notation above, we can say that:
Depth(distance from shore) = 30 ft
Answer C is right.