The scale factor of dilation is the ratio of the length of the sides of the new triangle to the length of the corresponding sides of the original triangle.
Length of the side BC in original triangle is:
BC= 2 units
and the length of the side B'C' in the transformed triangle is:
I just subtracted 8 out of all the answer choices until I was left with 1 (the leftover cupcake). 22-8-8=6 and you can't subtract 8 out of 6 and get 1 so it can't be the number of cupcakes baked on that day