Answer :
Each person pays a total of $2+x. There are 4 people in total, therefore, an expression that represents the total that the group pays is:
[tex]4(2+x)\text{.}[/tex]Simplifying the above expression we get:
[tex]8+4x\text{.}[/tex]If we substitute x=3 in the above expression we get:
[tex]8+4(3)=8+12=20.[/tex]Answer:
Part a)
[tex]8+4x\text{.}[/tex]Part b)
[tex]20[/tex]dollars.