Hey, I got a few ellipse problems I'm havin trouble with. Any help appreciated.

Write in standard form, showing work. (standard form is (x^2 / a^2) + (y^2 / b^2) = 1, right?)

1. 16x^2 + 25y^2 - 64x - 100y + 564 = 0

2. 5x^2 + 3y^2 - 40x - 36y + 188 = 0

3. 3x^2 + 4y^2 - 12x + 16y + 16 = 0

Find the equation of an ellipse that has foci (0, +-2) and the endpoints of the minor axes are (+-5,0). Write in standard form, showing work.