State the domain and range.

1. y = 20 - 2x^2

I know the domain here is all real numbers.

I am not sure about the range, but am guessing: all real numbers <= 20 Is this correct?

2. y = 25(-7x-4)^64

I know the domain here is all real numbers.

I am not sure about the range, but am guessing all real numbers <= -100 Is this correct?

3. y = x^2 / (x^2-16)

How would I do this one?

Thanks a bunch