To find the circumference of a circle you have to multiple the radius by 2 and also by pi. So, to find the radius when given just the circumference, who have to do the reverse operation and divide the circumference by 2 and also by pi to get the answer of 22.92993631, which you could of course round.
Answer:
It would be b I think
Step-by-step explanation:
6x+12y-6z+7x7y-28z= 13x+19y-34z
