Answer:
1. [tex]C=21x.[/tex]
2. [tex]C=(8x+104).[/tex]
Step-by-step explanation:
Let the number of people in the group be x. Denote the total cost as C.
1. If the regular cost is $21 per person, then the total regular cost for x people is [tex]C=21x.[/tex]
2. If the special cost is $8 per person, then the total special cost for x people is [tex]\$8x.[/tex] There is an additional $104 fee for a private room, thus the total special cost is [tex]C=(8x+104).[/tex]