00:01
So in the first equation, we have number 47, ln of x equal to negative 3.
00:10
You need to remember that when you see ln, that means you're working with a base of e.
00:16
So just rewrite that in exponential form.
00:20
You have e to the negative third equals x.
00:24
We want to approximate.
00:26
So we're just going to grab the calculator and raise e.
00:32
To the negative third power that is going to give me 0 .050.
00:43
Let's look at 48.
00:45
Ln of x minus 7 equals 0.
00:51
So first add 7 to both sides.
00:56
Once again, you have a base of e.
00:59
E to the 7th equals x, raise e to the 7th power, 1096 .633 .3.
01:14
Let's jump down to number 50, so we can do ones that are different than ln.
01:20
We have log 3z equal to 2.
01:27
So when you see log but no subscript, that means you're working with a common log in base 10.
01:35
10 squared equals 3z.
01:38
That's 100 divide both sides by 3 and you are going to get 33 .333...