### Home > PC > Chapter 9 > Lesson 9.1.4 > Problem9-55

9-55.

What is the average rate of change for the following functions over the given intervals?

1. $f(x)=\sin(x)$     $\left [\frac{\pi}{2},\pi \right]$

$\frac{\sin(\pi) - \sin\left(\frac{\pi}{2}\right)}{\pi - \frac{\pi}{2}} = ?$

1. $f(x)=\log x$    $[1, 10]$

$\frac{f(10) - f(1)}{10 - 1} = ?$

$\log(1)=0$