Yes, players on an MLB active roster must get at least the Major League minimum salary, whether or not they play.
10 - 9 fielders and the batter.
There must be a minimum and maximum of 9 players on the field for the defensive team which will include their current Pitcher on the mound however the offensive team can have a minimum of 1 player on the field and a maximum of 4 players on the field.
0. The middle of the inning is a part of the inning. There technically doesn't have to be any players on the field at that point.
25 Active Players 40 Players on the roster
There are 6 outs in each inning.
10 including the batter. 3 in the outfield and 4 in the infield and the pitcher and catcher, and batter.
25 on active roaster
25 active players on a MLB roster.
In MLB the minimum and maximum number of players on the field is 9. In each half inning their are 3 outs, so there are 6 outs per inning, three per team.