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:( my answer was D: all real #s R: all real #s
But I think that is wrong...

ya it is because x cannot be negative, you can't square root a negative unless you want imaginary :/

|dw:1337382785574:dw|

D: x >\= 0 r: y >\= 0 ?
I'm still confused. :/

Kay thanks :) I'm sorry but I'm just so awful at math...

np:)