If Cinderella’s shoe was a perfect fit, why did it fall off?

Because the spell wore off at midnight and her gown turned back to her regular clothes. Since she was originally barefoot, in order to return to her original status, the glass slipper had to fall off.

whole numbers.

step-by-step explanation:

we are given the average monthly rainfall (in millimeters) model r(m) for the years 1900-2009 as a function of the month number m.

as we can see m is taken for the number of months for years 1900-2009.

we know that number of months can't be a negative number or decimal number or a fraction.

so, the number of months could be only positive whole numbers.

therefore, whole numbers is more appropriate for the domain of r.