Quadratic functions are second-order equations of the form y=ax^2+bx+c. Their graphs form parabolas. The defining characteristic of a quadratic is that the acceleration of the outputs is a constant.
You are doing 133 divided by 6 to give you 55
95% of 600 is 570. When solving a percentage problem like this, simply convert the percentage into decimal form (.95) and that multiply that by the main number (600).
That would be f(x) = 4|x|. Reason is, the bigger the number that's multiplied by |x|, the narrower the graph will be. The opposite is true for the smaller the number, & so f(x) = .5|x| will be wider.
Hope this helps!