[tex] \frac{ {x }^{12} }{ {x}^{6} } = \\ [/tex]
[tex] {x}^{12 -6 } =[/tex]
[tex] {x}^{6} [/tex]
Thus c is the correct option .
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[tex] \frac{ - 57 {y}^{2} {z}^{3} }{3 {y}^{5} {z}^{3} } = \\ [/tex]
[tex] \frac{ - 19 \times 3 {y}^{2} {z}^{3} }{ {y}^{3} \times 3 {y}^{2} {z}^{3} } = \\ [/tex]
[tex] \frac{ - 19}{ {y}^{3} } \\ [/tex]
Thus a is the correct option .
