Question

Your friend has $100 when he goes to the fair. He spends $10 to enter the fair and $20 on food. Rides at the fair cost $2.00 per ride. Which function can be used to determine how much money he has left over after x rides?

f(x) = -2x + 70

f(x) = 2x + 70

f(x) = -2x - 70

f(x) = -30x + $100

Answer 1

Do you have any ideas?

Answer 2

I think its c
because he already has 70 dollar and you need to take it off

Answer 3

What do you think?

Answer 4

Well I think it is A

Answer 5

@nkhanfar It can't be, If it was then you would end up with -$$ say he gets on two rides, thats -2 times 2 which is negative 4-70 which is -74...

Answer 6

which one is it then

Answer 7

I think it would be A

Answer 8

@FEARLESS_JOCEY, That is correct. Because he has $70, and if he gets on 4 rides, -2*4=-8+70 which is the same as $70-$8, so that is correct.

Answer 9

Yay!! Thanks.

Answer 10

\[-2\times4=8 \] Then you would get \[-$8+70.00 \] And that's how much money he would have left over...

Answer 11

You're welcome...

Answer 12

Thanks for the medal!!!

Answer 13

Your welcome