The following expression models the total money earned by setting up a food stall at a funfair, where x represents the number of cheeseburgers sold.

C is correct option.

The constant 10 represents the cost of setting up the food stall even if no cheeseburger were sold.

Step-by-step explanation:

We are given expression

Let us suppose f(x) is total money earned by setting up a food stall at a funfair.

where, x represents the total number of cheeseburger were sold.

Therefore,

We need to collect the information about constant 10.

If we put x=0 into f(x)

f(0)=10

10 is a money earn when no cheeseburger sold.

It means 10 would be initial cost of setting up of Food stall.

Thus, The constant 10 represents the cost of setting up the food stall even if no cheeseburger were sold.