Water waves A snapshot of a water wave moving toward shore is described by the function z = 10 sin (2x – 3y), where z is the height of the water surface above (or below) the xy-plane, which is the level of undisturbed water.
a. Graph the height function using the window [–5, 5] × [-5, 5] × [–15, 15].
b. For what values of x and y is z defined?
c. What are the maximum and minimum values of the water height?
d. Give a
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