Let x be the number of hours the waiter works.
We know that waiter A offers his services for an initial $25 plus $5.75 per hour, the ammount Aaron will pay this waiter can be express as:
[tex]5.75x+25[/tex]In the case of waiter B we know that her initial is $28 plus $4.75 per hout, the ammount Aaron will pay can be express as:
[tex]4.75x+28[/tex]To find out at what ammount of hours they will charge the same we equate the expressions and solve for x:
[tex]\begin{gathered} 5.75x+25=4.75x+28 \\ 5.75x-4.75x=28-25 \\ x=3 \end{gathered}[/tex]Therefore, at 3 hours both waiters will charge the same ammunt of $42.25.