How do I do this problem

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

What is the solution to the system of equations? (–2, –8) (–1, –5) (0, –2) (2, 4)

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)