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

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Do you have any ideas?

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

What do you think?

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