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4. (09.02 HC) The function f(x) = -x2+20x - 75 models the profit from one customer, in dollars, a shop makes for printing photos, where x is the number of photos printed, and f(x) is the amount of profit. Part A: Determine the vertex. What does this calculation mean in the context of the problem? (5 points) Part B: Determine the x-intercepts. What do these values mean in the context of the problem? (5 points) (10 points) B i U Font Family - AA - A D E . E . E . 9