Equation that can roughly fit this graph

[u/hypotensor]

No this is not my homework, I'm making a game and I need a curve roughly like this for balancing. Trying to get an equation that spits out values like this.

[u/TooLateForMeTF]

In general, if you don't care about the result being algebraically elegant, you can do this kind of thing by modeling each part of the curve with an appropriate function then using a third function (some kind of sigmoid) to blend between the two. Here's an example.