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d1i1m1o1n [39]
3 years ago
10

The function ​f(x)​ is the total amount spent at a store, when purchasing x items that are $5 each and the items are not taxable

.
What is the practical domain for the function f(x)?



all positive integers

all real numbers

all whole numbers

all positive integers that are multiples of 5
Mathematics
2 answers:
elixir [45]3 years ago
6 0
First lets write out this function to get a better grasp of what x values, (domain) would apply.


f(x)=5x

The key word here is practical, a negative amount of items does not make sense so we can cross, whole numbers and real numbers off the list.

Positive integers that are multiples of 5 does not make sense, why would a shopper be restricted to buying items in pairs of five?


The most logical and only choice left is all positive integers.
Keith_Richards [23]3 years ago
3 0
F(x)=5x

normal domain: all real numbers
practical domain: <span>all positive integers

</span>becasue we can substituent with any positive integer in the place of x
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