The function #c=45n+5# can be used to determine the cost, c, for a person to purchase n tickets to a concert. Each person can purchase at most 6 tickets. What is an appropriate domain for the function?

1 Answer
Dec 1, 2016

Answer:

#0 <= n <=6#

Explanation:

Basically the 'domain' is the set of input values. In other wards it is all the permitted independent variable values.

Suppose you had the equation:#" "y=2x#
Then for this equation the domain is all the values that may be assigned to the independent variable #x#

Domain: The values you may chose to assign.
Range: The related answers.
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For the given equation: #c=45n+5#

#n# is the independent variable which logically would be the count of tickets.

We are told that no more than 6 tickets may be purchased by any one person. So #n# can only take on the whole number values between and including 0 to 6

So the domain is written as: #" "0 <= n <=6#
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~~~~~~~~~~~~~~~ Memory aid ~~~~~~~~~~~~~~~~~~~~~~~~~~~
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In the alphabet d for domain comes before r for range

You have to 'plug' in a value before you get your answer

So d first #-># input first
and r next #-># answer second

#d->" input "#
#r->" output"#