I really need help it's a test

There are 20 children in the cast of a class play and 8 of the children are boys of the boys 4 have a speaking part in the play and of the girls 8 do not have a speaking part in the play if a child from the cast of the place chosen at random what is the probability that the child has a speaking part

Erin bought christmas cards for $2 each to send to her family and friends. which variable is the dependent variable?

The vertices of a triangle are a(7.5), b(4,2), and c19. 2). what is