Question

Kelp please...

Answer 1

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

I think its the third or first one...

Answer 2

first, try plugging in a few numbers for each equation

Answer 3

For instance, according to the third equation, how much would he have left after 3 rides?

Answer 4

65?

Answer 5

How did you get that number?

Answer 6

I have no idea...
i got 35 or something like that and subtracted them...

Answer 7

You start with 100... you already spent $30 right?

100 - 30 = 70

Answer 8

ohhhh ok...

Answer 9

And rides are $2.00 each

Answer 10

2.00 per ride...

You have no idea how many rides exactly..

2x

Answer 11

so right now we have 2x + 70?

Answer 12

so if you were to ride 3 rides, for example, how much would you have left

Answer 13

Yes!

Answer 14

So the first one?

Answer 15

remember: it's -2x, not "2x" since you're spending money on for each ride

Answer 16

Aye aye capn!

Answer 17

I miss pirates online...:D

Answer 18

Thank you all!

Answer 19

Sure thing--good luck!