What is the simplified for of square root of 100x^36

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

Pls! does anybody know a shortcut for answering these types of questions in the future?

Iam a rectangle. my perimeter is 60 feet. how much are do i cover?