If f(x)=x^2-81 and g(x)=(x-9)^-1 (x+9) find g(x) x f(x)

The triangles are similar. what is the value of x? enter your answer in the box.

Answer this all of it i don’t know how to do it i wasn’t there because i was sick and it’s a nti today so i home not knowing what to do

What is the best name for the part of the figure identified by the arrow? line of reflection o line of symmetry plane of reflection o axis of symmetry