16 easy algebra questions, homework help

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What is the equation of a circle with a center at (-3, 6) and a radius of 7?
What is the equation of a circle with a center at (0, 9) and a radius of 9?
What is the equation of a circle with a center at (4, 0) and a radius of 1?
Write the equation of an ellipse with a major axis of length 8 and co-vertices (0,3) and (0,-3)
Write the equation of an ellipse with vertices (0, 5) and (0, -5) and co-vertices (2, 0) and (-2, 0).

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