I need help solving this particular problem!

Please help!

Let (S, P) be a probability space, and let A,B be any events. Prove the following statements.

(A) If A is a subset of B, then

P(B − A) = P(B) − P(A) and P(A) <= P(B).

(B) If A and B are independent, then A and S − B are independent.