Kendra is considering two different long–distance phone plans. phone plan a charges a $100 sign–up fee and 3 cents per minute. phone plan b does not charge a sign–up fee, but it charges 5 cents per minute.

3x + 4y -25 =0 represents the amount of change sianna should recieve

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.