Question: Problems 119128. The purpose of these problems is to keep the material fresh in your mind so that you are better prepared for later sections,

Problems 119–128. The purpose of these problems is to keep the material fresh in your mind so that you are better prepared for later sections, a final exam, or subsequent courses such as calculus.

Find the vertex of f (x) = −1/2 x2 +4 x + 5, and determine if the graph is concave up or concave down.

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