Find the slope of the tangent line at the given point

a) f(x)= x' - 2x, at P(0, 0 ) b) f (x ) = - X at P(2,2) x-1 2 c) f (x) = at P(2,2/3) 2 -1 d) f(x) =1- vx+1, at P(3,-1) e) f (x) = xx, at P(1,1) f) f (x ) = - at P(4,1) Vx - 1