Answer
Graph is A
Contour map is IV
Work Step by Step
Graph is A
When the x value is held constant, the function is a cosine function, which is true for cross sections of A. Moreover, as the value of x becomes larger, the amplitude of the cosine function increases, as expected.
Contour map is IV
First, the contour map must be periodic as y changes because we have a cos(y) function. Moreover, as the x value increases, the contour lines must get closer because the value of the function is increasing.
