Answer:
15
Step-by-step explanation:
Simply subtract the smaller number from the bigger number, and divide by 2. Or add the two numbers together and divide by 2.
Answer:
Use the inflection points to set up intervals. Substitute a value into each interval to find where the curve is concave up or down.
The graph is concave up
Average Rate of Change is given by the Slope of the Function
We know that :
✿ 
The Given Points are : (3 , -10) and (5 , -26)
Here : x₁ = 3 and x₂ = 5 and y₁ = -10 and y₂ = -26

✿ Option C is the Answer