Mark is in training for a bicycle race. he needs to ride 50 kilometers a week as part of his training. he rode 18.23 kilometers on monday and 13.94 kilometers on wednesday. how much more does mark need to ride to complete his training for the week?

Part a: sam rented a boat at $225 for 2 days. if he rents the same boat for 5 days, he has to pay a total rent of $480. write an equation in the standard form to represent the total rent (y) that sam has to pay for renting the boat for x days. (4 points)