Use your data to calculate the increase in flow rate in ml/min/mm Hg

I know this question has been posted previously, but it was several months ago. After reading it, thinking about it, and trying it, I still don't understand what the question is asking or how to do the calculation... 

Help?

Flow(ml/min):                       Pressure(mmHg):
35.0                                    25
70.1                                    50
105.1                                  75
140.2                                  100
175.2                                  125
210.3                                  150
245.3                                  175
280.4                                  200