a campground charges $30 for 2 people plus $4 for each additional person . the total amount owed is given by f(x) = 30 + 4x where x is the number of additional people. graph this function and give its domain

The domain of the function:

Is the whole real set. This means that the domain is :

domf=(-∞,∞)

This comes from the fact that the functions is a polynomial. Nevertheless, given that x represents the number  of people, in the context of the problem the domain has to be :

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domf= (0,∞)

The graph of the function is

step-by-step explanation:

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part a

x     y

0     8

1     7.5

2     7

3     6.5

4     6

5     5.5  

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part b

it is a function because for every x value there is only one y value

part   c

for every x value there is only one y value

x       y

0       8

1       7.6

2       7.2

3       6.8

step-by-step explanation: