ACTIVITY #1 A. Combine the following expressions.(In case you miss the steps and rules, do not hesitate to check them in the previous part of the lesson.) Yact The the 1.(10v2 + 6V-9) + (4v-5-8v2) ord 2.(-3a +b-4c-2)+ (12a + 4c-10-11b) 3.(8m -3n) + (12m + n) 4.(20h -5i + 10j -6k) + (2h + 4i-3k) 5.(7r2 s2 + 15rs) + (-4rs + 2r2 s2)​