After being dropped a certain ball always bounces back to 2/5 of the height of its previous bounce. after the first bounce it reaches a height of 125 inches. how high (in inches) will it reach after its fourth bounce?
a. 20
b. 15
c. 8
d. 5
e. 3.2

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.