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7. Given function y = f(x) =23 -12x + 20 (a) (8 points) Find all the open intervals on which f is increasing/ decreasing. Then

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7. Given function y = f(x) =23 -12x + 20 (a) (8 points) Find all the open intervals on which f is increasing/ decreasing. Then determine the r-coordinates of all relative extrema. (b) (8 points) Find all the open intervals on which f is concave up/down. Then determine the r-coordinates of all inflection points of f

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