Jocelyn is a receptionist at a dentist office. She books 72 appointments each day. Six out of every 18 appointments are cancelled. How many appointments are cancelled each day?

Johnny rode his bike to a friends house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was unable to play. what was his displacement for the total bike ride trip? what could you use as a reference point ? show the steps to solve this problem.