Find the sum. Write the sum as a mixed number, so he fractional part is less than 1. 4 2/1 + 3 3/5    2. 2 2/3 + 3 2/3 3. 6 4/5 + 7 4/5    3.9 3/6 + 2 2/6   4. 8 4/12 + 3 6/2   5. 4 3/8 + 1 5/8   6. 9 5/10 + 6 3/10