Can you help me on questions 10 and 12? Thank you so much!

3. J * + x 4. f (x) - * +x- 2 x 5 . f ( x ) - - x3 - x2 - 4x + 1 18. 6. f(x) = tan x + 5 cos x 7. f (x) = x2- 4x + 7 cos x, - 4 5 x =4 8. f(x) - sin x - 2TTS X 5 2 TT 9-12 Ill Produce graphs of f that reveal all the important aspects of the curve. Estimate the intervals of increase and decrease, extreme values, intervals of concavity, and inflection points, and use calcu- lus to find these quantities exactly. 9. f (x) = 8x3 - 3x2 - 10 10. f ( x ) = x' + 11x - 20 11. f ( x) = x19 -x2 12. f (x) = x - 2 sin x, - 2 TT E x 2TT 13-14 1Ill Sketch the graph by hand using asymptotes and inter- cepts, but not derivatives. Then use your sketch as a guide to pro ducing graphs (with a graphing device) that display the major features of the curve. Use these graphs to estimate the maximur and minimum values. 13. f (x ) = (x + 4) (x - 3)2 4( x - 1)