Please help and explain #1 & #2

1. Simplify each of the following expressions by applying one of the theorems. State the theorem used (a) x'yz+xz (b) XYZ +X'YZ+ XY'Z (XYZy (c) abc+a b+abc' e(D BC (d) A(C +D'B)+A'B (GE F)(D+BC) Multiply out and simplify to obtain a sum of products(S0P) (a) (ab+clb+c'd) 2