2 times the sum of 9 and the opposite of x

1. what are the missing reasons in the proof 2. it's in the second picture and 3

If f(x)= 3x+6 which of the following is the inverse of f(x)

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.