how would I go about creating a function like this?

[covert crest]

Where 47mil would give me 100, and the rest of the numbers in the image

[supple gazelle]

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[neat furnace]

I'd say use exponential regression

basically y = a * b^x + c

or else you could use polynomial regression too

6 data points means a unique 5 degree polynomial

you could use lagrange interpolation in that case

[neat furnace]

(find values of a, b, c using your data points)

[bronze compass]

or interpolate

[drowsy dock]

dam that's steep

where'd this come from? some data set?

did they ask you to just "guess the graph"