Can someone explain how? 1-6 on image 7-12 True or False If false explain why. 7. If y=f(x)g(x) then dy/dx f(x)g'(x) 8. If y=(x+1)(x+2)(x+3)(x+4) then d^5y/dx ^5=0 9.

If f'(c) and g'(c) are zero and h(x)=f(x)g(x) then h'(c)=0 10. If f(x) is an nth-degree

polynomial then f^(n+1) of (x) = 0 11. The

second derivative represents the rate of change of the first derivative 12. If the velocity of an object is constant, then its acceleration is zero