The mathematics faculty at a college consists of 6 professors, 11 associate professors, 4 assistant professors, and 11 instructors. if one faculty member is randomly selected, find the probability of choosing a professor or an instructor.
the probability is

Select the correct answer from each drop-down menu. a system of equations and its solution are given below. system a complete the sentences to explain what steps were followed to obtain the system of equations below. system b to get system b, the equation in system a was replaced by the sum of that equation and times the equation. the solution to system b the same as the solution to system a.]