For this case we have to:
h: It is the variable that represents the number of hours that Sarah works as babysitting.
If you need an amount greater than or equal to $ 81 for the next month to attend a concert, we have the following inequality:
[tex]9h\geq 81[/tex]
This means that you must work a minimum number of hours to get at least $ 81.
Answer:
[tex]9h\geq 81[/tex]
