Please help me understand each answer with simple steps

A junior baseball team has 10 pitchers, 2 catchers, 8 infielders, and 5 outfielders.In how many different ways could the coach select a pitcher, a catcher, an infielder, and an outfielder to put on a clinic for school children?

A school club pack has 12 children in it.In how many different ways could the pack leader select 3 Cub Scouts to attend a summer camp?

A student body club has 16 members.In how many ways can they elect a president, a vice-president, and a secretary?