Hello can you please help derivatives Calculus, 10 questions on the pic. Thank you

Ifthe second derivative of n} is i\"(x) = (2 x){xz 9}, on what intervals is x}concave down? 2. The position ofan object at a time t is 'ven by s(t} = t2' 3t: - 12t + 2? for t a El. Find the time{s)when the velocity is zero 3. The are of a square is increasing at a rate of it} square inches per minutes. At what rate is the length of one ofits ndes increasing when one of its sides has length equal to 2 inches? 4. At which I value[s}does the function x} = 21:3 + 332 351: has a relative mininuun so_ so 5. Use the denition ofihxe {derivative to nd limw . . . 12 El. Find the denvatlve of}: = 2x24 '5'. The cost of a producing a items is (In) = 2x3 1632 + Stills, nd the value of}: that minimizes the average cost 3. Find the point(s} of inection if anyr for the function its} = 41:3 + Bag + 4}: - 'i' Use calculator for question 9 and Ill lim 1: - 2 '3'. Evaluatexz JEJi 10. [f a company sells an item for p = 55 .02}: dollars each. and the cost of manufacturing 1: items is C(x} = 1650 + 13x x2 + .Ex3,nd the production level which maximizes the prot Round your answer to the nearest whole number