Porfavor ayuda chavales

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

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 5x^2 + 10x

Let x = a + bi and y = c + di and z = f + gi. which statements are true?