The circumference of a circle is 6.28 cm. What is the circle's radius?

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

Ineed i been stuck on this question since yesterday

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?