Simplify by combining similar terms:

17). 8a + 2b + 16a + 3b +5 =




18). 3x2+ 2x + 5x2 + 7x + 6 =




19). 3 nickels + 3 dimes + 3 quarters + 4 nickels + 5 dimes + 6 quarters=




20). 7 crackers + 6 biscuits + 5 cookies + 4 crackers + 3 biscuits + 2 cookies =