Question

The house-numbers on a certain street go from
\[1\] to
\[88\]. The function
\[B(n)\] models the type of the building whose number is
\[n\] according to the following key:
Building type Function output
Residential building
\[0\]
Commercial building
\[1\]
Government building
\[2\]
Other
\[3\]
Which number type is more appropriate for the domain of
\[B\]?

Answer 1

Integers — more precisely the positive integers (natural numbers) 1 through 88. House numbers are discrete whole numbers, not fractions or reals.