$$\frac{28}{16}\frac{7}{4}$$
$\frac{49}{16}=3.0625$
$$\frac{7}{4}\times \frac{7}{4}$$
$$\frac{7\times 7}{4\times 4}$$
$$\frac{49}{16}$$
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$\frac{7 ^ {2}}{2 ^ {4}} = 3\frac{1}{16} = 3.0625$