Which of the following can be used to show a cause-and-effect relationship between two variables?

a) a census

b) an experiment

c) an observational study

d) a sample survey

e) a cross-sectional survey

10.416 m/s

step-by-step explantion:

distance=100m

time= 9.6s

average speed=100/9.6

=10.416 m/s

"exterior angles = 360 / number of sides.

60 = 360 / sides

sides = 360 / 60

sides = 6"

55 degrees because 55+55=110 degrees

median- 36f

mode - none

mean- 33.7 ~ 34f