Linear and Exponential Functions

Question

Which one doesn’t belong 2,-2,-1/2,2.22,

Answer 1

2 doesn't belong.

The other 3 points fit y = 1.01706*(1.81333^x) - 3.84426

You can see which don't belong by graphing them. It's clear if you graph the points that (1,-2), (2, -1/2), (3,2.22) are on an exponential function.

I found the function using Desmos to make a regression estimate with R^2 = 1.