19} Suppose x) = x3 - 27x. Then f'(x) = 3x2 - 27 and x) has critical points atx = :3. a) Use the first derivative test to classify the critical points. (4 points] 13) What is the slope of the line tangent to x) at x = 1? (2 points) 20} Let x) = 34x3. Then f'(x) = 1294:2841"3 and f\"(x) = 2&1-(e\""3(6x4 + x). a) x) has a critical point at x = 0. Use the second derivative test to classify the critical point. (3 points] 13) Does f (x) have any inflection points