For some reason I keep getting the wrong answer, could you please explain how to work the equation below.

Consider an x distribution with standard deviation = 42. (For each answer, enter an exact number.)

(a) If specifications for a research project require the standard error of the corresponding distribution to be 2, how large does the sample size need to be?

n =

(b) If specifications for a research project require the standard error of the corresponding distribution to be 1, how large does the sample size need to be?

n =