answer all questions thank you for the help in advance will leave alike bliot? [ f(x)=frac{x+3}{x^{2}-7 x-40}

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answer all questions thank you for the help in advance will leave alike bliot? \[ f(x)=\frac{x+3}{x^{2}-7 x-40} \]Use the graph to determine the limit. (If an answer does not exist, enter DNE.) (a) $ \lim _{x ightarrow e^{+}} f(x)= $ (b) \( \lim _{x ightarrow c^{- 1 answer