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?

a- f(x) = −2x + 70
b-f(x) = 2x + 70
c-f(x) = −2x − 70
d-f(x) = −30x + $100

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?

a- f(x) = −2x + 70
 b-f(x) = 2x + 70
 c-f(x) = −2x − 70
 d-f(x) = −30x + $100

skullpatrol · Answer

Any ideas?

pandasneakers · Answer

i think is b because the 2 can change depending on how many rides he go on ... and that 100 -30 is 70

pandasneakers · Answer

or is it minus 70?

skullpatrol · Answer

Read carefully what the question is asking for

Which function can be used to determine how much money he has left over after x rides?

pandasneakers · Answer

so d ?

princeharryyy · Answer

Fx = 100-10-20-2*x

skullpatrol · Answer

Yup A^ is correct

skullpatrol · Answer

Each ride takes $2 off the $70 he has left.

skullpatrol · Answer

— ( $2 per ride )•( number of rides ) + 70

skullpatrol · Answer

that^ will tell you  how much money he has left over after x rides, right?