Question

A package of paper towels contains 3 rolls. Each package of paper towels costs $2.79.​

A function, f(x), is written to represent the cost of purchasing x packages of paper towels.

What is the practical domain for the function f(x)?
(a) all whole numbers that are multiples of 3
(b) all positive integers
(c) all real numbers
(d) all whole numbers

Answer 1

Answer: b. All positive integers

Explanation:

Answer 2

Answer: (b) all positive integers

Explanation:

We know that the domain of a function is the set of all values for x (independent variable) for which the function must be defined.

Given: A package of paper towels contains 3 rolls. Each package of paper towels costs $2.79.​

A function, f(x), is written to represent the cost of purchasing x packages of paper towels.

i.e. the number of towels must be a positive integer .

Hence, the practical domain for the function f(x) must be all positive integers.