Given the graph of the function f(x) shown below, find the average rate of change of the function f(x) on the interval [5,15].

Step-by-step Expression;
- Given; The function f(x) on the interval [ 5,15]
- To find the average rate of change of the function f(x)=?
x = 5 , y = 15,
I can't solve it anymore,please can you solving?