1. ${\left(\frac{2}{3}\right)}^3$

2. ${\left(\frac{4}{p}\right)}^2$ , where $p\ne 0$

3. ${\left(\frac{-2}{t}\right)}^6$ , where $t\ne 0$

4. ${\left(\frac{q}{-r}\right)}^7$ , where $r\ne 0$

1. ${\left(\frac{2}{3}\right)}^3=\frac{2^3}{3^3}=\frac{8}{27}$

2. ${\left(\frac{4}{p}\right)}^2=\frac{4^2}{p^2}=\frac{16}{p^2}$

3. ${\left(\frac{-2}{t}\right)}^6=\frac{{\left(-2\right)}^6}{t^6}=\frac{64}{t^6}$

4. ${\left(\frac{q}{-r}\right)}^7=\frac{q^7}{{\left(-r\right)}^7}=\frac{q^7}{-r^7}=-\frac{q^7}{r^7}$