The answer to this is A. 650. You find the surface area of the two cubes, then the rectangular prism, then you add them together.<span />
Your answer would be B.
The triangles would be congruent, because the lines GH and FI are congruent and the angle H and I are the same, and since the line HI is shared by the two, it would then be SAS.
The answer is C. Hope this helps