determine how many different values can arise by inserting one pair of parentheses into the given expression. 3 − 7 − 9 − 5

Step-by-step explanation:

(3 - 7) - 9 - 5 = -4 - 9 - 5

                   = -18

3 - (7 - 9) - 5 = 3 - (-2) - 5

                    = 3 + 2 - 5

                    = 5 - 5

                    = 0

3 - 7 - (9 - 5) = 3 - 7 - 4

                    =  3 - 11

                    = -8