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.
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