Question

Please check my work! (easy rate of change question)

The function below shows the number of car owners f(t), in thousands, in a city in different years t:

f(t) = 0.25t2 − 1.5t + 2.5

The average rate of change of f(t) from t = 5 to t = 8 is ______ thousand owners per year.

Answer 1

I got 1.75

Answer 2

First, I plugged 5 into the equation and I got 1.25

Then I plugged in 8 and got 6.5

Then I used the average rate of change formula and got:

\[\frac{ 1.25 - 6.5 }{ 5 - 8 } = \frac{ -5.25 }{ -3 } = 1.75\]

Answer 3

yes that's correct

Answer 4

Thanks!

Answer 5

yw