please show how to do number 13

Solve the problem below, using the conversion chart buttons along the bottom. Once you have answered, click on "Try a similar problem" to get another practice problem. A newly discovered extraterrestrial has purple blood cells. Those blood cells have a diameter of 2104in. What is the diameter in centimeters? Write your answer accurate to at least 1 significant figure. 2104in= Once you have answered this question, you may click "Try another similar question" to attempt more questions of this type