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5 November, 23:27

A salesperson has 50 shirts to sell and must sell a minimum of 20 shirts. The salesperson sells the shirts for $35 each. The amount of money the salesperson makes for selling x shirts is represented by a function: f (x) = 35x What is the practical range of the function?

All multiples of 35 between 0 and 1750, inclusive

All real numbers

All multiples between 700 and 1750, inclusive

All integers from 20 to 50, inclusive

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  1. 6 November, 00:59
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    Answer: all multiples of 35 between 700 and 1750, inclusive.

    Justification:

    The range of the function f (x) = 35 x is all the real numbers (zero, positives and negatives). But here you have these restrictions about the domain (this is the possible values of x):

    1) x is an integer number (the number of shirts)

    2) x is greater or equal than 20

    3) x is less or equal than 50

    Then, you have to find f (x) for the limit values

    f (20) = 35*20 = 700

    f (50) = 35*50 = 1750

    You can see that f (x) is the set 35*20, 35*21, 35*22, 35*23, ... until 35*50, i. e. all the multiples of 35 between 700 and 1750, inclusive.
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