I'm having a little trouble with my calculus problems. I need to find critical values, find x and y intercept, find if its increasing or decreasing and concade up or down.

Here are the problems i'm having trouble with. I don't even know know where to start. I'm having alot of trouble so any help will be appreicated.

Problems

1. -x^3+6x^2-9x+1

2. -x^3-12x^2-2

3. -x^2-8x-10

4. x^3-6x^2+9x+3