Simplify as a exponent:5^6*5^2/5^4

Which equation represents a circle with a center at (–3, –5) and a radius of 6 units? (x – 3)2 + (y – 5)2 = 6 (x – 3)2 + (y – 5)2 = 36 (x + 3)2 + (y + 5)2 = 6 (x + 3)2 + (y + 5)2 = 36

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

Plzzz answer both questions and i will give you 100 points