hello :
<span>14ax-y+2ay-7x = (14ax+2ay) +(-y -7x) = 2a(7x+y) - (7x+y)
</span>14ax-y+2ay-7x = (7x+y)(2a - 1)
I think it would take an average of both the numbers so first find the average of 60 and 90 by adding and dividing by two. You will get 75 seconds. That is the answer
If you don't already, use this online program called Desmos and put your equation into that. It's not available to me right now, but it should work for you.
So what makes a function a function is that each input (x) only has one output (y).
Set A is not a function because when x = 2, y = -2 and 3.
Set B is not a function because when x = 9, y = 3 and -3.
In short, the correct option is "Neither A nor B".
It would be 7.68 because you divided