I'm kind of stuck on these problems and would appreciate some help.

Also is there a way to find the rational roots on a Ti-84 graphing calculator?

The problems that I have trouble with are...

X^2-16=0

X^3-15X+22=0

X^4-7X^3+13X^2+X-20=0

X^4+5X^3+3X^2+45X-54=0

2X^4+X^3-22X^2+29X+20=0

X^4-4X^3+7X^2-6X=0

6X^3-31X^2+3X+10=0

X^3-X^2-3X+2=0

4X^3-8X^2+X+1=0

Thank you in advance.