Tickets to the concert were 2.50$ for adults and 1$ for students 1200$ was collected and 750 tickets were sold

Really need on these. i have no idea what to do

Describe the domain and range of y=2(3)^x-2+5

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?