Help with Polynomails?

Hi i need some help with 4 math questions if anyone knows how to do them *with the whole process can you please solve it for me. I got a bet with my friend on like 10 bucks for this. If you do answer please answer with full process and i will best answer you.
1st question 3x^2(x-1)+3x^3(x+2)
2nd question 5/3 (1/3z-1) – 5/9z(1+1/2)
3rd question (4x-y)(1-y)-[(x+y^2)(2-x)]
4th question 2x(3×2-2)+(1/3x^2)^2(0.2x+3)
the #/# is a fraction. “#” is any number.
Answer #1
So if I solve them for you, do I get the $10 that you weren’t supposed to win because you can’t do them?
Answer #2
i can send you 5
Answer #3
Eh, I’m cool then.
Good luck.
Answer #4
here ya go. i went ahead and simplified them as far as i could, so i’m pretty sure they’re correct. they were pretty brutal . oh and on the last one, i wasn’t sure about that second 2, so i just assumed it was a 3x^2
1. 3x^2(x-1)+3x^3(x+2)
3x^3-3x^2+3x^4+6x^3
3x^4+9x^3-3x^2
2. 5/3(1/3z-1)-5/9z(1+1/2)
5/9z-5/3-5/9z-5/18
-35/18
3. (4x-y)(1-y)-[(x+y^2)(2-x)]
4x-4xy-y+y^2-[2x-x^2+2y^2-yx]
y^2-4xy-4x-y-[2y^2-x^2-yx+2x]
4. 2x(3x^2-2)+(1/3x^2)^2(1/5x+3)
6x^3-4x+1/9x^4(1/5x+3)
6x^3-4x+1/45x^5+1/3x^4
1/45x^5+1/3x^4+6x^3-4x
wow. that was a lot of work (in other words i think i should get a lick of the reward .. )
Answer #5
wth? what are you supposed to do with these, just expand them? as they are not equated with anything i can see