00:01
So we're asked to find out what f at 200 means.
00:05
So i wrote down our equation right here of function f at x equals 15x minus 25.
00:12
And the first phrase in there it says let f at x represent the profit.
00:17
So that's why i wrote this down.
00:20
So whatever you calculate for f at x represents the profit.
00:25
Now the second half of that sentence is i think it's missing x.
00:30
And let x represent the number of t -shirts sold so x is a number of t -shirts t -shirts okay so then we're asked hey what statement is true when we have f at 200 so you substitute 200 into the function you replace right they're saying we just sold 200 t -shirts so plug that 200 in replacement of x right here and you should get 2 ,975 in money units.
01:08
I don't know what the it didn't say if it's dollars or other units.
01:13
Okay, so this is the money that represents the profit.
01:18
Remember, f and x is profit.
01:20
So it's then we're given the choice.
01:23
Well, what this is mean? the first option is it results in 15 and it means that 15 t -shirts were sold.
01:34
Nope, because this is not 15.
01:38
And that doesn't make any sense because it's not about the number of t -shirts that were sold.
01:46
F and x represents the profit.
01:49
So that's not correct...