Answer:
30
Step-by-step explanation:
if you take 3+6+9+12 you get 30
So you already know the difference between the new number and original number, so all you have to do now is plug it in to this: Percentage Change=Difference/Original Number x100. So 17.99/257=.07x100 which equals 7%. So B is the correct answer.
No you cant but do you know the formula of the circle