00:01
Okay, let's look at this problem.
00:02
So here i have two curves, b of t and d of t.
00:05
B of t represents the birth rate and d of t the death rate.
00:18
Okay, so we want to find the area between the two curves for t between zero and ten.
00:25
So graphically, so here i have b of t which looks like this.
00:32
And then i have d of t which looks like that.
00:36
All right, and here i have zero and here.
00:39
Here at 10.
00:42
So the area between the two curves, which is this part we want to find.
00:47
So we want to know to find the area between the two curves.
00:50
We use a definite integral.
00:52
So here, let's set up the integral to integrate the difference between the two curves.
00:59
So here, b of t is obviously greater than d of t...