Answer:
I would say 120 but that could be also be wrong but ill go with 120
Answer:
The parent function is 
That Parabola's equation is 
Step-by-step explanation:
I can't really explain much, but the top equation is a formula for <em>all </em>equations for a parabola. h and k are the x and y-values of the vertex. a is, well, a.
How did I find the equation of the parabola? Simple. Since the vertex is on the origin, h and k are 0. Also, because it intercepts (2,4) and (1,1), a=1.
1/10*(f-220) or 0.1(f-220)
I have attached the graph. I did this using desmos.com. Try it out sometime. I hope that helps.