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

Question

4 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] · Answer 1 · 2022-02-05T05:40:24+03:00

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] · Answer 2 · 2022-02-05T03:43:49+03:00

Keith_Richards [23]4 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

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

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