What is 10 percent as a decimal

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

Aline passes through 3,7 and 6,9 what equation represents the line

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.