I'm pretty sure it's -4x.
Answer:

you can solve problems by this equation
819,461 that is the answer
So, 4 cups of sugar is used in ONE muffin.
36 muffins is called yet Amelia will do 24.
Instead of multiplying 36, you will multiply 24 by 4.
24 × 4 = 96
She will need 96 cups of sugar to make 24 muffins.