mayrarodriguez mayrarodriguez 15-01-2021 Mathematics contestada What is the sum of the expression below? (9c – 8d) + (2c – 6) + (–d + 3) A. 11c + 9d – 9 B. 11c – 9d – 3 C. 7c – 7d – 3 D. 7c – 9d + 3