3. Draw a contour map of the function 9(5, 3;) : Elms? + 3?} showing several level moves. 4. The wave heights h. in the open sea is a function of the speed it of the wind and the length of time t that the wind has been blowing at that speed. The table below contains some values of the function h = f(v, :5). Here it is measured in feet. 1: in knots. and t in hours. (a) Estimate (with units) f\" and f; at the point (a, t) 2 (2t), 15). (b) What is the equation for the tangent plane to the graph of f at the point corresponding to (v. t) = (20, 15)? proximate it. a. 13' 1e- 17' 15 .2125 23-31 (d) Estimate (with units) fun, fut, In. and f\" at the point (tat) = (20,15)