Math
posted by April .
Find the domain of the following functions.
1. y= radical(x3)  radical(x+3)
2. y= [radical(2x9)] / 2x+9
3. y= radical(x^2  5x 14)
4. y= [cubed root(x6)] / [radical(x^2  x  30)]
I'm terrible at finding domains.. so any help with these problems would be appreciated. & if you have any general tips with finding domains, I would love them!

recall that
√z is defined only for z >= 0
division by 0 is undefined