Need asap, my teacher didn't go over these since we only had 1 period

Add. express your answer in simplest form. 12 9/10+2 2/3 = i need u guys to me find the answer to this question

Which polynomial correctly combines the like terms and expresses the given polynomial in standard form? 8mn5 – 2m6 + 5m2n4 – m3n3 + n6 – 4m6 + 9m2n4 – mn5 – 4m3n3 n6 + 7mn5 + 14m2n4 – 5m3n3 – 6m6 –2m6 – 5m3n3 + 14m2n4 + 7mn5 + n6 14m2n4 + 7mn5 – 6m6 – 5m3n3 + n6 n6 – 6m6 + 7mn5 + 14m2n4 – 5m3n3 show work

The bottom of a vase is a square.each side measury y+11 units.the square has a perimeter of 55 units what is the value of y?