Can you please help me with the following problems?

Graph the ellipse.

((x-1)^2))/(9) + ((y-2)^2))/(4)=1

I got:

4(x+1)^2 + 9(y-2)^2=36

I divided all the terms by 36

then I got: ((x+1)^2))/(4) + ((y-2)^2)/(4)=1

the center is (-1,2)

This is where I am stuck at and dont know what to do next or how to graph it.

16(x-2)^2+4(y-1)^2=64

I divided all the terms by 64

then I got: ((x-2)^2)/(4) + ((y-1)^2)/(4)=1

the center is (2,1)

This is also where I get stuck.

Find the foci of the ellipse whose equation is given

((x+3)^2)/(36)+ ((y-3)^2)/(25)=1

I got: foci at (-3, +squareroot 11, 3) and (-3, -squareroot 11, 3)