The average rate of change of a function f(x) over an interval (a, b) is given by

Therefore, given a function, f(x), over an interval (2, 9), the average rate of change of the function can be found using the expression
19.25x Hope this helped you....
18x = 162
x = 9
There are 9 cartons filled with 18 eggs each, which is 162 eggs in total.
15/3 - 14/2
This is the expression you are looking for
( I'm not 100% sure but I believe this is correct ! )