Question

please solve this question
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Answer 1

ANSWER = 4r/ s⁴

$\frac{3r {}^{ - 2} s {}^{3} }{ \: 12r {}^{ - 3} s {}^{7} } = \frac{ {3s}^{ - 2} }{ {12r}^{ - 3} } \times \frac{ {s}^{3} }{ {s}^{7} }$

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{ {12r}^{3} }{ {3r}^{2} } \times \frac{1}{ {s}^{4} }$

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{4r}{ {s}^{4} }$