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Find the intervals on which f is increasing or decreasing, and find the local mascimum and minimum values of f. (10 ) f ( x ) = x3 - 6.0 - 13520 ( 12 ) f ( 20 ) = 20 3 ( 20 - 3 ) ( 14) f( 20 ) = 20 + 4 DC 2 Find the intervals on which f is concave upward or concave downward, and find the infection points of f. ( 16 ) f ( c ) = 2203 - 9 202 + 12x - 3 ( 18 ) f (20 ) = 20 3/ 20- 4 3 a Find the intervals on which of is increasing or decreasing b . Find the local maximum and minimum values of f. C. Find the intervals of concavity and the inflection pants. ( 19 ) flic ) = be - 2x + 3 (20) f(x ) -2 ( 22) f ( x ) = cos xx- 2sinn, O