A golf ball is selected at random from a golf bag. If the golf bag contains 4 black balls, 9 yellow balls, and 12 brown balls, find the probability of the following event. The golf ball is black or yellow.

Two angles are complimentary, as shown in the diagram below part a: use the definition of complimentary angles to set up an equation that can be used to solve for the value of x. part b: solve for the value of x. in your final answer, include all of your calculations.