11 Let f(x) = 7x-6 +2 Find the open intervals on which f is concave up (down). Then determine the x-coordinates of all inflection points of f 1. f is concave up on the intervals 2. f is concave down on the intervals 3. The inflection points occur at x = Notes: In the first two, your answer should either be a single interval, such as (0,1), a comma separated list of intervals, such as (-inf, 2), (3,4), or the word "none". In the last one, your answer should be a comma separated list of a values or the word "none".

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