The total cost to go to ATV riding is X dollars per hour plus a 2.50for running a helmet write an expression to represent the cost in dollars for three people to go to ATV riding for four hours each

Jackson earns $25 per hour as a tutor at the college library. he set a weekly spending budget of $130 each week and puts the remaining money in his savings account. how many hours must he work this week to have at least an extra $50 to put in his savings account