Question

I don’t know how to find the value of X in this problem an answer and explanation would be nice.

Answer 1

`\sf\\\textsf{Triangles CDE and ABC are similar.}\\\textsf{Since corresponding sides of similar triangles are proportional,}\\(AB)/(DE)=(AC)/(CD)\\\\or,\ (15)/(9)=(35)/(x)\\\\or,\ x=(35*9)/(15)\\\\or,\ x=21`