Ablood pressure of 60 over 80 would indicate that a patient had…a) high blood pressureb) normal blood pressurec) low blood pressured) not been correctly monitored (this reading is impossible)

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point