@calculusxy @phi @chpatterson @sapphiremoon

Your friend has $80 when he goes to the fair. He spends $4 to enter the fair and $12 on food. Rides at the fair cost $1.25 per ride. Which function can be used to determine how much money he has left over after x rides?

f(x) = 1.25x + 64
f(x) = −16x + $80
f(x) = −1.25x + 64
f(x) = −1.25x − 64

Question

@calculusxy @phi @chpatterson @sapphiremoon

Your friend has $80 when he goes to the fair. He spends $4 to enter the fair and $12 on food. Rides at the fair cost $1.25 per ride. Which function can be used to determine how much money he has left over after x rides?

f(x) = 1.25x + 64
 f(x) = −16x + $80
 f(x) = −1.25x + 64
 f(x) = −1.25x − 64

brooke..help00 · Answer

@phi please help

phi · Answer

one way to figure it out.  if he goes on *no* rides, how much money will he have left ?

mathmale · Answer

He enters the fair with $80 and then pays for admission and food.  How much $ does he have left, before going on any rides?

will.h · Answer

Hint 
He has 80 dollars and paid a total of 4 dollars to enter the fair and 12 dollars for food how much does he has left out of the 80 dollars?

brooke..help00 · Answer

He spent $16 to get in and get food. You would subtract that from what he had to start with which was 80. Is he has $64 left.

brooke..help00 · Answer

@mathmale @Will.H @phi

will.h · Answer

Indeed 64

will.h · Answer

So we also have 1.25 per ride 
That means 1.25x 
We know that it is a withdrawal for each ride so that would be negative 
So 
F(x) = -1.25x + 64 
That would be the total

will.h · Answer

Make sense?

brooke..help00 · Answer

Yes! Thanks so much. Everyone🙂