Jordan wants to see if earthworms prefer rough or smooth terrain to crawl through. What will be his independent variable? This is what he will change in his experiment.
change the type of worm
how much food they have
change the terrain
O where each worm starts from

Mary starts from her house, walks 80 meters south, and stops to chat with her aunt on the sidewalk. after chatting for a few minutes, she walks 125 meters to the west to meet a friend and then walks 45 meters north with her friend to a cafe for lunch. overall, she takes 10 minutes to do all this. what is mary’s average speed?