00:01
Okay, so you have the function 20 minus x squared.
00:05
Let's sketch this first.
00:14
So you're going from 2 to 4.
00:18
So 1, 2, 3, 4.
00:24
At 2, the function is equal to 16.
00:32
At 4, the function is equal to 4.
00:42
And it is a parabola.
00:46
So it looks like this.
00:49
And then it says, sketch the graph, show the rectangles using left hand endpoints, and n equals three.
00:57
So if n equals three, then delta x is two thirds.
01:11
So you have two, and then you're going to add two thirds to that, which is eight thirds...