This question is a Circumference (in terms of pi) Can anyone solve it?

26π

Step-by-step explanation:

C=2Πr

r=13

c=2(13)π

=26π

i think it's ф or x=6,-6

step-by-step explanation:

-x^2=-36

x^2=-36

ф

or

if you mean by : -(x^2)=-36

it'll be: x^2=36

x=6,x=-6

hope it'll ! have a good day!

you for asking!