Answer:
513 people per square mile
Step-by-step explanation:
because
6u + 3u = 18
9u = 18
u = 18/9
u = 2
Step-by-step explanation:


and then minus them
The formula to find the circumference of a circle is C=2*pi*r.
Substitute 9 1/4 or 9.25 for r.
C=2*pi*r
C=2*pi*9.25
C=18.5pi
The circumference of the circle would be 18.5pi.