Can someone help me with these, I'm desperate: 1. Find the standard form of the equation of the circle having the following​ properties:
Center at the point (6,7)
Tangent to the x-axis

2. Find the standard form of the equation of the circle with endpoints of a diameter at the points (9,2) and (−7,8).

3. Find the standard form of the equation of the circle having the following​ properties:
Center at the origin
Containing the point (3,-5)

4. A Ferris wheel has a maximum height of 305 feet and a wheel diameter of 290 feet. Find an equation for the wheel if the center of the wheel is on the​ y-axis and y represents the height above the ground.