Answer:
13) 1
14) st^3
15) m^-2n^-2
Step-by-step explanation:
[tex]13) \: \frac{xy}{xy} = 1[/tex]
[tex]14) \: \frac{ {s}^{2} {t}^{4} }{st} = s {t}^{3} [/tex]
[tex]15) \: \frac{ {m}^{2} {n}^{2} }{m{}^{4} n ^{4} } = {m}^{ -2} {n}^{ - 2} [/tex]
The above solutions are basic mathematical division operation.
