On a city map drawn on a coordinate plane, the city park is located at (4, 9) and the school is at (20, 9). what is the distance between the park and the school in the map units?

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.