I think the correct answer is d
So since you haven't given us the actaul equation Im gonna guess that x equals to -7, and lets just say the x equals to uhhhhhh, i dont know how about 42? That sound about right? What im trying to say is next time can you please give out the equation? If you respond I could probably help you next time.
Answer:4320cm
Step-by-step explanation:
(length of the arc)/(length of the radius)=central angle
lengthof the arc/20=216
lengthof the arc=216×20
length of the arc=4320cm