Which expression calculates the speed in meters per second of an object that travels a distance of 100 m every 20 s?
a 100.20
b 100+20
c 100/20
d 100-20

Students are getting signatures for a petition to increase sports activities at the community center. the number of signatures they get each day is 3 times as many as the day before. the expression 3^6 represents the number of signatures they got on the sixth day. how many signatures did they get on the first day?