So i transferred schools and i was in algebra 2 last year, now im in precal and the school is a lot more difficult and there are some things i havent covered.

because if i dont learn anything itll be uselessCan u give me the steps on how u did it?

how do i find the domain of 4x^3+3 when x greater than or equal to 0, and the domain of x+1 over 2x+1

also how do i simplify this? 4(3-x) / x-3

and another x+13/x^3(3-x) * x(x-3)/5

can i simplify this? x^2-36/6-x im at (x+6)(x+6)/6-x can i simplify it any further?

last one: simplify the complex fraction x-4 / x/4-4/x (writing it down on paper would make it more clear with the / as fraction)

-thanks