00:02
All right.
00:02
So you have a graph shown that shows the amount of air pollution removed by trees in an urban region for each month of the year.
00:10
So your first question that you ask, and really the only one that you give us is like an answer choice, right? are these curves the graphs of functions? and you're going to be yes.
00:20
Okay.
00:21
So let's mark that as a yes.
00:24
Let me get my little marker.
00:26
So the answer is yes.
00:31
They are functions.
00:32
And if you look at it.
00:33
This little question for part b, look at the graphs for particulate.
00:37
Where is the function increasing? okay.
00:40
And where is the function decreasing and constant? so anytime it's increasing, so increasing is going to look like it's going up.
00:56
Okay.
00:57
Anytime it's decreasing, meaning it's going to go down, decreasing.
01:07
So anyway, it goes down.
01:08
It could be a small down.
01:10
It could be a really steep down.
01:13
Okay? anytime it's like a negative sloping line.
01:16
And then constant, the constant means it's going to be a straight horizontal line.
01:25
So horizontal line.
01:28
Okay.
01:29
So for example here, this is a constant from j to m on the blue line here for the particulates because we only want the particulates.
01:39
So the blue.
01:41
Okay.
01:42
Let me undo that and i'll put it as blue.
01:49
Okay.
01:50
So let's see...