Why Katie deleted the answer of my question ?

Write the system of equations represented by the matrix. 0 1 2 4 -2 3 6 9 1 0 1 3

Acircle has a circumference of 7.850 units. what is its radius?

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