-4/x^5y^13 because since you have negative exponents on the top you switch them to the bottom
Answer:
4
Order of Operations is what you have to use
R = 13.1
so
<span>diameter = 13.1 x 2 = 26.2 km
</span>circumference = 2 pi r = 26.2 pi km
or
circumference = 26.2 x 3.14 = 82.27 km