Answer:
D. -3r^2 + 11r + 9
Step-by-step explanation:
8r + 4r^2 + 3r + 9 - 7r^2
shift somethings around so it's easier to tell
4r^2 - 7r^2 + 8r + 3r + 9
simplify/add
-3r^2 + 11r + 9
