Please help with 23. 27. 29 and 39

Find the derivative

23. f(s) =s1/s+1

27. y= 1/(x^2 - 1) (x^2 + x + 1)

29. y = x^4 /2 - 3/2(x^2) - x

39. Suppose u and v are differentiable functions of x that are differentiable at x = 0 and that u(0) = 5, u'(0) = -3, v(0) = -1, v'(0) =2

Find the values of the following derivatives at x = 0

a. d/dx (uv)

b. d/dx (u/v)

c. d/dx (v/u)

d. d/dx (7v - 2u)