We have the expression
[tex]-99\colon3^2\cdot5[/tex]
Since the division appears first, and there is no parenthesis, we need to solve the division before the product. We obtain:
[tex]-99\colon3^2\cdot5=-99\colon9\cdot5=-11\cdot5[/tex]
Then, solving the product, we obtain:
[tex]-11\cdot5=-55[/tex]
Therefore, the final result is -55.
