Answer :
Robert will surely spend $200 for the hall.
Moreover, we will spend $30 per friend, so with x friend he will spend $30x.
In total, depending on the number x of friend, he will spend
[tex]p=30x+200[/tex]
Robert will surely spend $200 for the hall.
Moreover, we will spend $30 per friend, so with x friend he will spend $30x.
In total, depending on the number x of friend, he will spend
[tex]p=30x+200[/tex]