Hello.
First of all, let the number be t.
The product of 5 and t is written like so:
[tex]\mathrm{5t}[/tex]
9 increased by means we add 9, so let's add 9 to 5t:
5t+9
Now, this expression is greater than or equal to -18:
[tex]\mathrm{5t+9\geq -18}[/tex]
Therefore, the final answer is:
[tex]\mathrm{5t+9\geq -18}[/tex]
I hope it helps.
Have a nice day.
[tex]\boxed{imperturbability}[/tex]
