Answer from cs61c-ah (Charles Lee 16102343) for Question 1
c5 = g4 + (p4 * g3) + (p4 * p3 * g2) + (p4 * p3 * p2 * g1) + (p4 * p3 * p2 * p1 * g0) + (p4 * p3 * p2 * p1 * p0 * c0)