00:01
Okay, so we get some questions about this function f of x, which is equal to n of x divided by d of x.
00:12
And we see the graph for f of x in the question.
00:17
So, a, when x is equal to 4, n of x is how many times greater than d of x? well, let's look at the graph and we see where x equals 4, f of x, which is what the graph is telling us, looks to be about, let's say it's a third.
00:41
It's hard to tell exactly.
00:45
So at x equals 4, f of x from the graph is equal to about a third.
00:53
So that means since f of x is equal to n of x over d of x, and if it's a third, that means that n of x is about one third the value of dnx.
01:18
Just moving d of x up here, because the f of x is the ratio of the two.
01:23
So if that ratio is one third, that means d of x is three times greater than n of x.
01:30
Okay.
01:31
B, if n of a is 5 .55 times as large as dna, so 5 .55 times dna, then what do we know? well, that means n of a divided by d of a is equal to 5 .55.
01:59
But n of a over d of a is exactly what f is defined as, so the value of f of a is 5 .55...