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Question 1164911: The cost of printing digital pictures is given by y = 0.13x, where x is the number of pictures that you print and y is the cost in dollars.
a) Determine the domain and range of this relation. Why is the relation a function?
b) Write the equation in function notation. Interpret the function in terms of the context.
c) Find f(5) and f(12). What do these values represent?
Answer by Theo(13342)   (Show Source):
You can put this solution on YOUR website! the domain is the value of x can be any integer greater than zero.
the value of x can't be negative since the number of digital prints can't be negative.
the value of x can't be 0 since since you don't go into a store to make 0 prints.
the range is the value of y greater than or equal to .13 in increments of .13.
the relationship between x and y is a function because each and every value of x results in one and only one distinct value of y.
in function notation, y = .13 * x is written as f(x) = .13 * x
f(5) replaces x with 5 to get f(5) = .13 * 5 = .65
it tells you to evaluate the function when x = 5.
x = 5 means you printed 5 digital pictures.
f(5) means it cost you 65 cents to print 5 digital pictures.
f(12) replaces x with 12 to get f(12) = .13 * 12 = 1.56
it tells you to evaluate the function when x = 12.
x = 12 means you printed 12 digital pictures.
f(12) means it cost you 1 dollar and 56 cents to print 12 digital pictures.
since x had to be an integer, it was impossible to get a value of y that was not in increments of .13
in fact, the number of increments of .13 is given by the value of x.
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