The circumference of a circle is about 40.82 inches. What are the diameter and the radius of the circle? Round to the nearest tenth and show all work.

Teresa is maintaining a camp fire. she can keep the fire burning for 4 hours with 6 logs. she wants to know how many logs (y) she needs to keep the fire burning for 18 hours. she assumes all the logs are the same how many logs does tressa need to make a 18 hour fire?