Help!!

These two triangles are similar. What is the value of YX?

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Amir wants to proportionally increase the size of a photo to create a poster for his room. the size of the original photo is shown. complete the statement and then answer the question to represent ways that amir can increase the size of his photo.