Masterchief117 Masterchief117 31-10-2016 Mathematics contestada For the problems below, simplify if possible. If not, write "not possible". 11.) 3a - 5 - a 12. ) 5s - 9 13.) 3 * 2 * a * a * b 14.) 3(x - 1) + 5x 15. ) 7( 1 + 2) + 8c