Statistics Help

Working on some homework and i cant seem to figure out the answers to these questions. Im hoping somebody here could provide some insight?

A) What is the sum-squares for the four-way interaction in a completely randomized factorial design?
B) Assuming each of the four manipulations are fixed effects, what values should be used for the numerator and denominator of an F-test for the four-way interaction?
C) The true F value is given by a ratio of two values that we are estimating. What is the numerator of our estimated F an estimate of and what is the denominator an estimate of?