Hey everyone, I need some help with my homework. I've been trying since Monday evening to solve them but I think my brain is dry already... I already solved the other five but these three just won't budge. Thanks!

1) Describe each eq'n in the ff. system. Sketch the graphs of the eq'ns in the system using only one set of axes.

{ y=-3/x

{

{ y=x^2-3x-1

2) Given that r1, r2, and r3 are the roots of the 3rd deg. polynomial function

P(x) = x^3-2x^2-23x+k, find the exact value of the squares of the roots r1^2+r3^2+r3^2.

3) Solve for x: 27(4^x)+19(6^x)-8(9^x)=0

Thanks guys!