Answer: 
Step-by-step explanation:

Subtract 15 on both sides.


Solve ;



3x + 15 = 34
3x = 19
x = 6 1/3 is the answer to the question
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?