Answer:
14
Step-by-step explanation:
Average rate of change is given as [tex] \frac{f(b) - f(a)}{b - a} [/tex]
Where,
a = 4,
f(a) = f(4) = (4)² + 3(4) = 16 + 12 = 28
b = 7,
f(b) = f(7) = (7)² + 3(7) = 49 + 21 = 70
Plug in the values into the formula
Average rate of change = [tex] \frac{70 - 28}{7 - 4} [/tex]
[tex] = \frac{42}{3} = 14 [/tex]
