Formulating and solving inverse variation functions part 1 of 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

Which expression is equivalent to 3^3 + 2^2?

Which letters from the table represent like terms? a and b b and c a and d b and d