I need only even number from 6 to 16 solved with work shown. Not the odd ones one evens

In Exercises 5-16, find the intervals on which the function (a) increasing, (b) decreasing, (c) concave up, (d) concave down. Then find any (e) local extreme values, (f) inflection point 5. y =1+x - x2 - x4 6. y = ex-1 - x 1 X 7. y =- 8. y = V1 - x2 x3 - 1 X 9. y = cos x 10. y = x2 + 2x + 3 11. y = In |x], -25x$2, x#0 12. y = sin 3x + cos 4x, 0S xS 27 x50 13. y = 4x - x3, x>0 7 3 + 5x2 + 4x + 2 3 15. y = x4/5(2 - x) 5 - 4x + 4x2 - x3 16. y = x - 2