Question 103077
f(x) = 16 - x2; g(x) = 4 - x
Find f + g. 
f+g = 16-x^2+4-x
= -x^2-x+20
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The graph would be a parabola opening downward with
vertex at x = -b/2a = -(-1/-2)= -1/2

Then f(-1/2) = -(-1/2)^2-(-1/2)+ 20 = -1/4+1/2+20 = 20 1/4
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Domain is All Real Numbers
Range is All Real Numbers <= 20 1/4
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Graph:
{{{graph(400,300,-10,10,-10,30,-x^2-x+20)}}}
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Cheers,
Stan H.