00:02
Okay, we're given these two points on the graph, which i put into a table there.
00:08
And first we're being asked to find the one unit growth factor.
00:17
So if i've got a general exponential, i can say it's a times b to the x.
00:28
B is that growth factor, and a is the initial value.
00:46
But just looking at our table here, since our two x coordinates are one unit apart, that b value is the number that i multiply 1 .77 by to get to 2 .3.
01:09
So 1 .77 times b is 2 .3.
01:17
Let me write that as a algebraic expression.
01:22
1 .77 times b equals 2 .3.
01:27
So if i solve for b, and divide both sides by 1 .77, and i get b is 2 .3 divided by 1 .77, which is 1 .299.
01:53
Let's call it 1 .30.
01:58
Well, let me check, were there any rounding rules? i think there's a lot of rules here, let's see.
02:08
Write the expression that represents the value of the growth factor rather than a rounded decimal.
02:14
Ah, okay.
02:16
So they're saying rather than calculate that, let's just leave it as 2 .3 over 1 .3.
02:36
2 .77.
02:39
So that's our one unit growth factor there.
02:45
Okay, and then part two, we want the percent change.
02:52
Write the expression that represents the value rather than a rounded decimal, interesting.
02:59
Okay, so the percent change, we're just going to subtract one from that.
03:15
Yeah, so we'll just do, makes more sense if i had it as 1 .30, it makes more sense i subtract one, i can see it's the percent change is 30%.
03:34
But what it's asking us to do is take that expression and subtract one...