Plzz help me out 11 points

Which statement justifies why angle ebc measures 90?

15/16 as a decimal rounded to the nearest hundredth

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.