How many nhl teams are listed when college/junior/club team is listed as newton north high school (ushs-ma)?
create table table_2850912_7 (nhl_team varchar, college_junior_club_team varchar, PRIMARY KEY (nhl_team))
select count(nhl_team) from table_2850912_7 where college_junior_club_team = "newton north high school (ushs-ma)"