Question

If f= {(2, 3), (5,7), (3, 3), (5, 4), (9, 1)), what is the range?

Answer 1

Answer: {1,3,4,7} which is choice D

To list out the range, you list the y coordinate values of each point of the function. Each point is of the form (x,y). Any duplicate values are tossed out when we talk about a set. All we care about are the unique values. It's common practice to sort the values of the set from smallest to largest.

Side note: Choice A is listing the x values of each point, which is the domain.