A rational expression R(x) has the following critical numbers and sign behavior: Critical numbers (in increasing order): x = -10 (undefined), x = -3 (zero), x = 8 (undefined), x = 9 (zero). For 8 < x < 9, R(x) has sign +. Sign flips at x = -10, -3, 8. Sign does not flip at x = 9. Solve R(x) > 0. Choose the correct solution set and a correct explanation about including/excluding endpoints.