What be. 2+8? and 8*?

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

The line containing the midpoints of the legs of right triangle abc where a(-5,5), b(1, 1), and c(3, 4) are the vertices.

The rectangle on the right is the image of the rectangle on the left. what transformation would result in this image? reflection rotation translation dilation