the population of london woods was 82,500 in 2000. in 2010 the population was 89,100 which is the percent of change in the population

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.