[الشيمآء]

1: f'(x) = 2x
f'(-2) = -4
f'(0) = 0
f'(4) = 8

2: r'= - (2/3s^3) + (15/4s^4)
r''= (2/s^4) - ( 15/s^5)

3: y'= -5x^4+36x^2-8x-35

4: a: y = -x/18 +9/4
b: the smallest slope is -4 at ( 0 , 2 )
c: y= 8x-14
y=8x+18

بالتوفيـــــــق ~
^_^