00:01
So this file here, it is represented by the capital raised and ipos.
00:06
Now, t represents the number of years since 2010.
00:10
So let's start with part a.
00:12
Part a wants to know what's going to be in 2015.
00:16
So since t represents time since 2010, we're going to use t is equal to 5.
00:22
So i'm going to do c of 5, and that's going to be equal to negative 2 .79 times 5 minus 3 squared.
00:31
Plus 34.
00:32
So what that means is we're just going to use our calculator to figure out what that equals.
00:37
So the nice thing here is 5 minus 3 is a whole number to 2 squared is 34 and then plus the 34.
00:45
So what i get here is 22 .84 as our answer.
00:50
Now this is representing the capital raise.
00:54
So this is in terms of money.
00:56
That's also in billions.
00:58
So we would do 22 .84 billion.
01:01
Billion dollars as our label.
01:05
All right, for part b, we want to know when it's going to be $30 billion, race.
01:09
So that means we're going to set it equal to 30.
01:11
But if 30 is equal to negative 2 .79 and then t minus three squared plus 34.
01:18
So step one is for us is going to be subtract.
01:21
So 30 minus 34 is a negative four.
01:23
It's okay that we're getting that negative number there because in front of the t minus three squared, we also have another negative.
01:29
So we're going to start by doing negative 4 divided by negative 2 .79.
01:34
It will be some long decimal.
01:35
So let's go ahead and round it to couple of decimal places as we write it down.
01:40
So 4 .3 is equal to t minus 3.
01:44
Now in my calculator, i'm going to take the square root of the long number.
01:48
So i have something in here like 1 .43369 -175 so on.
01:53
So i'm going to use that just to help us get a more exact answer.
01:57
So in the end, i get plus or minus 1 .123.
02:01
Places, 97 is equal to t minus three.
02:05
I'm going to go ahead and use that.
02:07
So t minus three is equal to negative 1 .197.
02:10
And then t is equal to, oops, t equals, and t minus three is equal to the positive 1 .197.
02:19
And then we're just going to add and subtract.
02:21
So negative 1 .197 plus three gets us about 1 .803.
02:27
And then 1 .197 plus 3, and this one is going to get us 4 .197.
02:35
So in the end, we have, again, this is since 2010.
02:38
So here tells us we're in the year 2011.
02:43
And then for the second one, it would be 2014...