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16. What should be added to 27x2-32x + 40 to obtain 56x2 + 19x + 72?
a. 29x2 + 51x + 32
b. 29x2 - 51x + 32
c. 29x2 + 50x + 32
d. 29x2 + 51x - 32
17. What is the sum of 2x24. 4x + 5 and 8x2 - 7x +9?
a. 10x2-3x + 14
b. 10x2 + 3x + 14
c. 10x2-3x - 14

d. 10x2 - 7x + 1