3 questions to be answered I need the answers separately and the work

2021... Do Octave Online . Cl. Question 2 3 pts 9 1 0 Details Q Using the figure of f() above, determine the signs (positive, negative, or zero) of y = f(x), f' (x), and f''(x) when x = 3. The sign of f(3) is Select an answer v The sign of f' (3) is Select an answer The sign of f' ' (3) is Select an answer .Question 3 5 pts 9 1 0 Details If f (t) = ( - 5t - 6)est find f' ( t ) = Question 4 5 pts 91 0 Details 4 sin x Let f (20) = 2 + cos x Find f' (ac ) . f' ( 20 ) =