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 the following table.
the values that you need on the table are.. 20hr/30 knots= 17
20hrs/40 knots= 28
20hrs/ 50 knots= 40
Use the table to find a linear approximation to the wave height function when v is near 40 knots and t is near 20 hours.
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