Another june 2008 math bregents question?

Question

the question with the circle, and the dilation of 2. the original radius was 9, i just multiplied by 2 and got 18.

is that right?

Answer 1

yezzir.

ur rite.

i did the same n had no idea wat i was doing

n i was so happy when i found out it was right =D

Answer 2

idk if it was right but that is what i did too

for the center i also multiplied by 2 and got

  (-8,4) is that what u got?

Answer 3

The radius was 18, I dont know exactly how they wanted you to prove that. I just used the distance formula.

Answer 4

Yea, 18's for the radius, but for the first part it was like "the center of the dilation is at the origin" or something and that completely threw me off Dx