What is the center of the circle with the following equation?

What is the area of the sector of the circle formed between the -axis and the point on the circle found at when the equation of the circle is as follows?

Round your answer to the nearest hundreth.

What is the area of the sector of the circle formed between the -axis and the point on the circle found at when the equation of the circle is as follows?

Round your answer to the nearest hundreth.

If the center of a circle is at and it has a radius of , what positive point on the does it intersect?

Give the axis of symmetry of the parabola of the equation