The wave heights h in the open sea depend on the speed v of the wind and the length of time t that the wind has been blowing at that speed. Values of the function h = f (v, t) are recorded in feet in Table 4.
(a) What is the value of f (40, 15)? What is its meaning?
(b) What is the meaning of the function h = f (30, t)? Describe the behavior of this function.
(c) What is the meaning of the function h = f (v, 30)?
Describe the behavior of this function.

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Duration (hours) 10 15 20 30 40 50 10 2 2 2 4 4 5 15 5 9. 30 9. 13 16 17 18 19 19 25 40 33 14 21 31 33 28 19 29 36 40 45 48 50 50 24 60 37 47 54 67 69 62 2. 2. 2. Wind speed (knots)