Alex, erik, mia, zack was playing their ipad alex play 1x6 hours erik play 2x8 hours : 3 mia play 9x3 hour : 3 zack play 3x7 hours who play more from least to big

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.