Your throw your ball into a air from height of 4.2

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

Reflect the point (7,0) across the y-axis

If 3x+8=3x+8 is it one solution or no solution