I NEED HELP REALLY BAD

Ab and bc form a right angle at point b. if a= (-3,-1) and b= (4,4) what is the equation of bc?

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

Atriangle has verticals at b(-3,0), c(2,-1), d(-1,2). which transformation would produce an image with verticals b”(-2,1), c”(3,2), d”(0,-1)?