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
2 answers:
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.
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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