Answer:
1.75
Step-by-step explanation:
[tex]m=\frac{f(b)-f(a)}{b-a}[/tex]
[tex]m=\frac{f(8)-f(5)}{8-5}[/tex]
[tex]m=\frac{6.5-1.25}{3}[/tex]
[tex]m=\frac{5.25}{3}[/tex]
[tex]m=1.75[/tex]
Therefore, the average rate of change of f(t) from t=5 to t=8 is 1.75
