Determine the truth value of the following sentence when A, B are true, X and Y are false, and S and P have unknown value. Show your work. (A amp;...

1. Determine the truth value of the following sentence when A, B are true, X and Y are false, and S and P have unknown value. Show your work. (A & X) v ~[(Y -> S) & (P v (B & (S -> S)))] 

2.Use either a full or partial truth table to determine whether or not the following argument is valid.

(P v Q) -> ~(R & S)

~(R & P) -> ~S

~(P v Q) v S

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(S v P) -> ~(Q & R)

Please help me solve these two problems and explain briefly.Thank you!