I need help with 72, 73, and 74. I will give brainliest if you answer all!

Answer:
72:-
[tex] - c - c[/tex]
73:-
[tex] - 4b - b[/tex]
74:-
[tex] - 3b - b[/tex]
Step-by-step explanation:
The trick is that when you see the bracket with a - symbol then the variable also becomes - symbol