First, what does thegraphon the screen plotlooklike?

A quick glance at the values, which start by going up but then go down again, indicates to me that this is not a straight line but might be close to a parabola.

If it looks more like a parabola, say with vertex upward, then try [tex]y= ax^2+ bx+ c. Since that has the three coefficients, a, b, c, you will need three data points to determine them. I recommend using the two end points, (0, 2400) and (10, 2900), and (4, 14000) where it appears to have its maximum.