The legnth is irrelivant
we know that
Circumference=2 times pi time radius
c=40
40=2 times pi times radius
divide both sides by 2
20=pi times radius
divide both sides b pi
20/pi=radius
the radius is 20/pi cm or aproximately 6.366199048 cm
Answer:
D. on the x axis is the best answer

add 2q to both sides.

subtract 5 to both sides.

divide 5 to both sides.

the answer is: