Some calc questions! need help

anyone answer these?

Find the critical numbers of f(x)=x^4(x-3)^3

Find any absolute or local maximum and minimum values of f(x)=8-2x if x__>__ 6.

Evaluate f(x)=sin(x^2), and tell whether its antiderivative F is increasing or decreasing at the point x = -4 radians.

Find critical numbers of function

y=5x^2+20x

How many points of infelction are on the graph of the function

f(x)=12x^3+14x^2-7x-9

Find the maximum or minimum points of the function

f(x)=(1-x^2)^2 +6x^2

Find *f*

f"(x)=12x+24x^2

Find the smallest possible area of an isoceles triangle that is circumscribed about a circle of radius r.