00:01
For this problem, we are asked to estimate the rate of change from point a to point b and from point a to point c.
00:10
So, to begin, we've already determined that the change in density from point a to point b was 140.
00:20
Then the change in, i suppose we could say delta y, the change in vertical position.
00:27
Now we need to estimate that.
00:31
Now let's see here.
00:32
What i can do is create a little line segment that will be corresponding to our scale there.
00:43
Grab that line segment and that i cannot rotate.
00:48
Okay, cool.
00:50
I'm going to pause for one second here.
00:53
All right.
00:54
So what i've done here is i have scaled the image so that scale given corresponds to one of my grid lines.
01:02
And now we can go from a to b and see that, okay, it looks like we're going about, i'd say that looks like about a gridline and a half.
01:17
Yeah, maybe a little bit more, but we can estimate that as being delta y is about 1 .5.
01:23
So the average rate of change from point a to point b is going to be 14 over 1 .5, which is going to be another...