2x + 2y - x - (8 + 1)?

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

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

Write the pair of fractions as a pair of fractions with a common denominator