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D equals 38.2 I think because t equals 9.55. You would add -16t with -4t and get -20t. Which would turn into D=-20t^2+382. Since you can't multiply 2 with -20t, you would divide it by 382 which would be 191. D=-20t+191 with this, you would subtract 191 from +191 which would cancel out and it would turn the problem into -191=-20t. You would divide -20 from itself and -191 and get t=9.55. Then you plug t where it was in the problem and then you get that D=38.2. I hope my answer is right and it helps you.
Answer:
Option A
Option B
Option E
Option G
Option A and E go together
and
Option B and G go together.
Each friend gets 16/4 muffins
Each friend gets 16 ÷ 4 muffins
Each friend gets 4 of the 16 muffins
