Your friend has $100 when he goes to the fair. He spends $10 to enter and $20 on food. Rides at the fair cost $2 per ride. Which function can be used to determine how much money he has left over after x rides?

A.) f(x) = -2x + 70
B.) f(x) = 2x + 70
C.) f(x) = -2x - 70
D.) f(x) = -30x + 100

The answer is A. As the friend spends $30 getting into and buying food at the fair. So he has $70 left. That means c and d are not right.

To find the number of rides he/she can go on we would need to subtract the number of rides times -2 as he/she is losing money.
So 70 is positive and you are subtracting 2 times the amount of rides (-2).

So the answer is A.

I hope this helps!

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Your friend has $100 when he goes to the fair. He spends $10 to enter and $20 on food. Rides at the fair cost $2 per ride. Which function can be used to determine how much money he has left over after x rides? A.) f(x) = -2x + 70 B.) f(x) = 2x + 70 C.) f(x) = -2x - 70 D.) f(x) = -30x + 100

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Your friend has $100 when he goes to the fair. He spends $10 to enter and $20 on food. Rides at the fair cost $2 per ride. Which function can be used to determine how much money he has left over after x rides?

A.) f(x) = -2x + 70
B.) f(x) = 2x + 70
C.) f(x) = -2x - 70
D.) f(x) = -30x + 100