Question

Bailey saves money at the end of each month. The function f(x) = 10x + 50 models the total amount he has saved after 'x' months. What is the domain of the function?

A) (50, 60, 70, ....)
B) (60, 70, 80, ...)
C) All positive real numbers
D) all non-negative integers

Answer 1

• D) all non-negative integers

Explanation:

The function f(x) = 10x + 50 models the total amount he has saved after 'x' months.

The domain is x-values, which is the number of the months.

x can only be zero or positive integers (since you can save after the month is complete), therefore the last option is correct.