How do you solve the following for x?

5,600 x 10^3 = a) 560 b) 5,000,600 c) 5,600,000 d) 56,000

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?

How is the equation of this circle written in standard form? x2 + y2 - 6x + 14y = 142 a) (x - 3)2 + (y + 7)2 = 200 b) (x+ 3)2 + (y - 7)2 = 200 (x - 6)2 + (y + 14)2 = 142 d) (x+6)2 + (y- 14)2 = 142