please help with question 7, 8 and 9 for discrete mathematics

7. Select the Logical Equivalence or Rule of Inference that validates the argument. (F(a)G(a))H(a)F(a)(G(a)H(a)) Association (Assoc.) Universal Generalization (U.G.) Distribution (Dist.) Conjunction (Conj.) 8. Consider the following argument: xF(x)xG(x)x(F(x)G(x)) Complete the proof below by filling in the missing statements in steps 2,5 and 7 . 9. Consider the following argument: p(qr)pqr Complete the proof below by filling in the missing reasons in steps 3,4 and 5