What is the range of this function {(3,4)(5,,-,,8)}

To solve this problem you must apply the proccedure shown below:
 1. You have the following information given in the problem above:
 {(3,4)(5,8),(9,-4),(-2,1),(0,8)}
 2. Therefore,by definition, you have that the range is the set of all the values of y given. Keeping this on mind, you have that the range is:
 Range:{4,8,-4,1,8}
 Therefore, as you can see, the answer is: Range:{4,8,-4,1,8}.

The range consists of all the output values (2nd values in the ordered pairs given), without duplication:

{4, 8, -4, 1), or, in ascending order, {-4, 1, 4, 8}