If triangles are similar, which must be true

Lena reflected this figure across the x-axis. she writes the vertices of the image as a'(−2, 8), b'(−5, 6), c'(−8, 8), d'(−4, 2).

What is x and y intercepts for y=x+7

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g