Answer:1/2
Step-by-step explanation:
4 cups of flour for 8 batches of brownies, so if you put that as a ratio, it becomes 4:8, which is equal to 1:2.
So that means you need 1 cup for 2 brownies, so for 1 brownie, it's 1/2 cup.
If that helped, please give me brainiest.