Final answer:
Austen needs 34 additional sticks of butter.
Step-by-step explanation:
In order to determine how many additional sticks of butter Austen needs to bake a total of 37 cakes, we need to calculate the difference between the desired number of cakes and the cakes Austen has already baked.
Number of additional sticks of butter = 37 - 3 = 34
Therefore, Austen needs 34 additional sticks of butter to bake a total of 37 cakes.