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Part a.

To determine the graph or to plot the graph you just need to use your function

Select three points of x in random eg 1 2 3

Use your equation to determine the corresponding values of y

eg when x = 1

y=-5(1)^3= -5

Do the same for the other points. Then check to see which graph will fulfill the above points.

part b

The graph is symmetric about the origin because every point on the right hand side is reflected on the left hand side and vice versa about the origin(0, 0)