Which of the following functions is graphed below?

Pls will give brainliest and all p.s u can zoom in if u cant see plss

Ill mark the brainliest if you me with the these three questions 7,8,9

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?