Create an equivalent expression for 1.5 cubed over 1.3 raised to the fourth power all raised to the power of negative six.

1.3 squared over 1.5 cubed
1.3 to the twenty-fourth power over 1.5 to the eighteenth power
1.5 cubed over 1.3 squared
1.5 to the eighteenth power over 1.3 to the twenty-fourth power