How would I solve these? with included steps

Problem 9. (15 points) Suppose that 7:373 3+6 . HI) = (A) Find all critical values of f. If there are no critical values, enter None. If there are more than one, enter them separated by commas. Critical value(s) = C] (B) Use _i_i_'it__s_rv_a__l__n_c_>_t_a_t_i_or_i_ to indicate where x) is increasing. If it is increasing on more than one interval, enter the union of all intervals where f(:z:) is increasing. Enter{ } if the interval is empty. Increasing: C] (C) Use interval notation to indicate where f(a:) is decreasing. If it is decreasing on more than one interval, enter the union of all intervals where f(a:) is decreasing. Enter{ } ifthe interval is empty. Decreasing: (D) Find the x-coordinates of all local maxima of f. If there are no local maxima, enter None. If there are more than one, enter them separated by commas. Local maxima at a: = C] (E) Find the I-coordinates of all local minima off. If there are no local minima, enter None. If there are more than one, enter them separated by commas. Local minima at a: = D Note: You can earn partial credit on this problem. Problem 8. (10 points) (a) Find the equation of the tangent line to f (x) = Va at x = 27. y (b) Use your answer to part (a) to estimate the value of V 26.7. V 26.7 ~ Note: You can earn partial credit on this