Answer:
Step-by-step explanation:

Linear: third graph from the left
Quadratic: fourth graph from the left
Exponential: first graph from the left
To find this out, look at the type of graft and then its factors.
The answer here would be
x = 21, y = 25
7 cm: 35000 cm (7*5000)
2.8 cm: 14000 cm (2.8*5000)
2 cm: 10000 cm (2*5000)