I don't understand how to solve that please help me with this question

Exercise 2.5. Determine if the given table describes a function. If so, deter- mine its domain and range. Describe which outputs are assigned to which inputs. a) -5 3 -1 6 0 5 2 8 3 7 b ) 6 17 4 -2 4 8 -2 0 3 C) 19 7 -2 3 -11 y 3 3 3 3 3 3 2.3. EXERCISES 31 d) T 1 2 3 3 4 5 y 5.33 9 13 13 17 V19 e) 0 1 2 2 3 4 y 0 2 3 3 4