Please help I will give 15 points

Answer! if you don’t mind, can you explain

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?

The actual length of side t is 0.045cm. use the scale drawing to find the actual side length of w