Tina earns £6.40 per hour and works 35 hours per week. Her rent is £84 per week. From next month her new hourly rate of pay will rise by 5% but her rent is increasing by £4 per week.
How will this change the amount she has to spend after paying her rent and by how much?

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?