Which of the following is an example of qualitative data?
a. the fish swam in a zigzag motion.
b. the contents of the stomach are mixed every 20 seconds.
c. the temperature decreased from 20oc to 15oc.
d. the six pairs of robins hatched an average of three chicks each.

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