Answer:
a C= (0, 0), r = 3
Step-by-step explanation:
For 15th question: a Is the correct answer
[tex] {x}^{2} + {y}^{2} = 9 \\ {(x - 0)}^{2} + {(y - 0)}^{2} = {3}^{2} \\ equating \: it \: with \\ {(x - h)}^{2} + {(y - k)}^{2} = {r}^{2} \\h = 0 \\ k = 0 \\c = (h, \: \: k) \\ c= (0, \: \: 0) \\ {r}^{2} = {3}^{2} \\ r = 3[/tex]
