How many times greater 3x10^4 than 4x10^2

If 10 to the 4th power is 10,000, and 10 to the second power is 100, and multiply 3 by 10,000 which would be 30,000, and 4 by 100, it would be 400, so your answer is 29600. I hope this helps! Also if I am wrong, please tell me, I did the best I could with the information I had. 

X^2 - 4x +(4/2^2) + y^2 + 8y + (8/2^2) = -4 + (4/2^2) + (8/2^2)(x + 2)^2 + (y + 4)^2 = -4 + 4 + 16your center is (-2, -4) and the radius is the sqrt of -4 + 4 + 16 which is 4