00:01
Here, we're given a graph and we're asked to find out what is the direction and the concavity of each of these intervals.
00:10
So let me just talk about each one separately.
00:13
So first, let's talk about increasing.
00:16
So for part a, that's going to be from a to b.
00:19
We are increasing because it looks like it's going up.
00:22
So it's increasing.
00:25
For b, that means from b to c, we're decreasing because it looks like it's going down.
00:32
And then for c, that's going to be from c to d.
00:34
It's starting to go back up again.
00:36
So it's increasing.
00:38
And then d from d to e, it's decreasing.
00:41
For e, which is from e to f, that's going still be decreasing.
00:45
It's going down further.
00:47
For f, that means from f to g, that means it's increasing because it started to go back up.
00:54
At g, it's increasing still.
00:57
H to i, it's going to be increasing again...