Answer:
-4
Step-by-step explanation:
Just add the two given angles together.
Answer:
The rate of change of the function is -5.
Step-by-step explanation:
Given : Function 
To find : What is the average rate of change ?
Solution :
Function 
The rate of change is the first derivative.

Derivate w.r.t. x,

Therefore, The rate of change of the function is -5.
The three points and two points must swop, and the different slopes and the same slope must swop too.