Answer:
1. b, 2.c, 3.b
Step-by-step explanation:
for 1, b is the nonproportional one because it has a +5 at the end, for 2, c is the proportional one because thats the only one that has a constant relationship of x2, in number 3, the non proportional one is b because there is an added cost and it does't have a constant relationship.
