HELP! What is each formula called and when do I use them? Examples would be great as well

MB = P, op = V P . ( 1 - P) n T= X - Mo xit's SNn Z - P - Po DIZ p . (1-P ) Po. (1-po) n n Z = P1 - P2 where p = xit x 2 VP- CI-B ) - (1 + 1 ) n1 n2 n, + hz PI - P, I Z' JR. (1- ) + P2' (1 -P2) n