Plz help me plz

In a school 2/3 of the students study a language of those who study a language 2/5 study french

Let the closed interval [a , b] be the domain of function f. the domain of f(x - 3) is given by (a) the open interval (a , b) (b) the closed interval [a , b] (c) the closed interval [a - 3 , b - 3] (d) the closed interval [a + 3 , b + 3]

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