Maryroseportin7viz Maryroseportin7viz Math Answered Combine the following expressions 11. (10v2+6v-9)+(4v-5-8v2) 12.(-3a+b-4c-2)+(12a+4ac-10-11b) 13.(8m-3n) +(12m+n) 14.(20h-5i+10j-6k)+(2h+4i-3k) 15.(7r2s2+15rs)+(-4rs+2r2s2)