Use an exponent to write each expression

1.
[tex]3.6 \times 3.6[/tex]
2.
[tex]9 \times 9 \times 9 \times 9[/tex]
3.
[tex] \frac{4}{5} \times \frac{4}{5} \times \frac{4}{5} \times \frac{4}{5} [/tex]