I need help with chemistry but there is always ppl on math so im putting it here please help. no links will report. no random answers please. im asking kindly. I will give brainliest if right :)

question: how much energy is being released ​

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?