If c(x)=4x-2 and d(x)=x^2+5x what is (c•d)(x)

To prove that def ~ gfh by the sss similarity theorem using the information provided in the diagram, it would be enough additional information to know that

Some boys and girls were asked if they had a pet. one third of the group were boys. there were 20 boys. 20% of the girls had a pet. boys with a pet : girls with a pet = 1 : 5 i need to know how many girls there are.

Witch represents the inverse of the function f(x)=1/4x-12