Domain and range (check my answers)

1) $\displaystyle y=5x-4 $

D:all real no.

R:all real no.

2)$\displaystyle y=-x^2+7 $

D:all real no.

R:all real no.

3)$\displaystyle y=\frac{5-x}{x-2} $

D:all real no. except 2

R: all real no.

4)$\displaystyle y=\sqrt{4-x} $

D:x<=4

R:all real no.

5)$\displaystyle y=\sqrt{x^2-16} $

D:-5<=x>=5

R:all real no.

6)$\displaystyle y=\sqrt{4-x^2} $

D:-2<=x<=2

R:0<=y<=2

7) $\displaystyle y=\sqrt{x^2-1} $

D:-1<=x>=1

R: all real no.

8)$\displaystyle y=^3\sqrt{x}-x $

D:all real no.

R:all real no.

9)$\displaystyle y=\frac{1}{x} $

D:all real no. except zero

R:all real no. except zero

10) $\displaystyle y=\frac{x}{x-2} $

D:x not = 2

R:y not = 1

(If any are wrong tell me which one and try solving it for me )

Thank you