i need help please

Question

You and some friends are going to a museum. Each ticket costs $4.50.

If n is the number of tickets purchased, write an equation that gives the total cost, c, of buying n tickets.

Suppose the total cost for n tickets is $36. What is the total cost if one more ticket is purchased?

Answer 1

First question:

 

c(n) = ($4.50)n

 

Second question:

 

c(n + 1) = ($4.50)(n + 1) = ($4.50)n + ($4.50)(1) = $36 + $4.50 = $40.50