1. The range is a set of values of a function. As we see at the graph, the function cannot be <-4. But it can be -4 and any greater number. So the answer is B, y>=-4.

3. (f+g)(x) = f(x) + g(x) = (x^2 + 3) + (x - 7) = x^2 + 3 + x - 7 = x^2 + x - 4. The answer is A.