Smith's catering company prepares and serves food for parties.

the company charges a base fee of $100
The company also charges $18 per person for food.
which function can be used to find c, the total amount it costs for a party of p people?

The function that can be used to find c, the total amount it costs for a party of p people, would be:

c(p) = 100 + 18p

Where c is the total cost, p is the number of people at the party, $100 is the base fee, and $18 is the cost per person for food.