Exercise18
In each situation, which number set do you think is most appropriate?

The number of dogs a student has owned throughout their lifetime.
This number is best considered as a
?
natural number
whole number
integer
rational number
irrational number
real number
. 
The difference between the projected annual expenditures and the actual annual expenditures for a given company.
This number is best considered as a
?
natural number
whole number
integer
rational number
irrational number
real number
. 
The length around swimming pool in the shape of a half circle with radius \(10\,\text{ft}\text{.}\)
This number is best considered as a
?
natural number
whole number
integer
rational number
irrational number
real number
. 
The proportion of students at a college who own a car.
This number is best considered as a
?
natural number
whole number
integer
rational number
irrational number
real number
. 
The width of a sheet of paper, in inches.
This number is best considered as a
?
natural number
whole number
integer
rational number
irrational number
real number
. 
The number of people eating in a nonempty restaurant.
This number is best considered as a
?
natural number
whole number
integer
rational number
irrational number
real number
.