PLEASE HELP ASAP, ILL GIVE BRAINLIEST

Consider the functions below. function 1 function 2 function 3 select the statement which is true about the functions over the interval [1, 2] a b function 3 has the highest average rate of change function 2 and function 3 have the same average rate of change. function and function 3 have the same average rate of change function 2 has the lowest average rate of change d.

Just tell me how to set up the equation.

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.