jfgafkafak jfgafkafak 13-11-2020 Mathematics contestada Simplify Each Expression By Combining Like Terms. 1) 11x+9x 2) 8y-7y 3) 5t-7t 4) -n+4n 5) 5w^2 + 12w^2 6) 2x^2 - 9x^2 7) -4y^2 + 9y^2 8) 6c-4 + 2c-7 9) 5-3x+y+6