Explanation:
Student A would be introducing more error. While student B is subtracting the actual filter paper used in the experiment, Student A is using the mass of a different filter paper, which may have a slightly different mass than the filter paper that was used. To avoid having to aacount for this, or introducing such an error, follow Student B in weighing the filter paper before adding the sand.
I hope this helps.
Its B because it goes straight up
Which of the following terms best describes the nucleus of a radioactive element?
C. Unstable
Because two different equations cannot have the same amount of heat being released unless they are equal and in this case they are not