00:01
Okay, so the way to find average rate of change is to look at f of x2 minus f of x1 and then divide by the difference, 2 minus x1.
00:17
Okay, so this problem is just going to require a lot of calculator work.
00:21
Let's do this.
00:22
Let's plug this in for each thing that we have.
00:27
So let me, so we have this.
00:32
The first one is 9 and 4.
00:36
So what is it between 9 and 4? and we have f is equal to square root of x.
00:41
So what is it between 9 and 4? well square root of 9 is 3, square root of 4 is 2, and then 9 minus 4 is 5.
00:55
So this is going to be 1 fifth, okay, or 0 .2.
01:03
For the second one, we get 5 and 4.
01:08
So you do square root of 5 minus square root of 4 is 2, and then 5 minus 4 is 1...