If a point is randomly selected from the colored area of the graph, what is the probability that it will be in the yellow region?

On a piece of paper graph f(x)=5•(0.4)^x

Which is a true statement about an exterior angle of a triangle a. it is formed by two segments that are not sides of the triangle, b. it forms a linear pair with one of the interior angles of the triangle, c. it is complementary to one of the interior angles of the triangle. d. it is formed by two segments that are sides of the triangle.

Graph the equation. select integers for x