The annual unemployment rates in the United States can be modeled by E(x) = 0.005x2 −0.2x + 7.5, where x is the number of years after 1980.
a. Graph the function, using a window of [0, 60] for x and [0, 10] for y. Set xScl at 5 and yScl at 1.
b. Find the vertex of the equation and interpret its meaning.
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