Victoria spins the spinner 18 times, and it stops at the letter 'b' 10 times. if she spins the spinner a 20th time, what is the theoretical probability that this time it will stop at the letter 'b'?

1 over 20
1 over 18
1 over 14
1 over 10

Charlie is at an amusement park that has 18 different rides. each ride costs $1.75. the function c(r) = 1.75r represents the total amount of money that charlie will spend if he goes on r rides, but he never goes on the same one more than once. what domain and range are reasonable for the function?