Two thirds a number x plus 6 is 9

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 base of 1/9 to the power of 2

Iwill give ! if m∠a=59 and m∠3=81°, what is m∠b? m∠b= _[blank]_°