Question

eduardo is selling candy bars for a school fundraiser. he is given a box containing 80 candy bars to sell. each bar sells for $3. the function f(b) represents the amount of money eduardo raises from selling b candy bars.
what is the domain of f(b)?
all whole numbers from 3 to 80
all whole numbers from 0 to 80
all whole numbers from 0 to 3
all whole numbers

Explanation:

The domain of a function represents the valid input values. Here, $b$ is the number of candy bars sold. Eduardo can sell 0 bars (sell none) up to a maximum of 80 bars (the total he has). The number of bars sold must be a whole number, since you cannot sell a fraction of a candy bar.

Answer:

all whole numbers from 0 to 80