Apply the formula: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, where $a^n=z^{11}$, $a^m=z^{15}$, $a=z$, $a^m/a^n=\frac{z^{15}}{z^{11}}$, $m=15$ and $n=11$
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