Sarah has $20 saved. if she will save her allowance for the next 3 weeks, and she gets $10 per week for her allowance. at the end of the week, she gets $150 in birthday money. how much money will she have after the 3 weeks? which of the following sets of equations represents this problem?

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?