First of all, this is not an observational study, but an experiment, since we have two groups and one of the two groups is manipulated or treated. In an observational study the subjects are only observed.
Second, the students did not choose their groups - so we can't choose the last answer.
Therefore the correct answer is:
This is an experiment because a treatment was applied to a group.
10 units right then 10 units down
Answer:
A. 251.33 cubic units
Step-by-step explanation:
volume of cone = (1/3) * area of base * height
Since your base is a circle, the area of the base is pi * r^2.
Now we have
volume of cone = (1/3) * pi * r^2 * h
volume of cone = (1/3) * 3.14159 * 4^2 * 15
volume of cone = 251.33 cubic units
I would say either A or C, hope I helped! Sorry if I didn't!! Good luck though! :)