Lana is the oldest of four sisters. her youngest sister is half her age. the other two sisters are twins 2 years younger than lana. when the four sisters' ages are added together, the result is 45. if the youngest sister is n years old, what is n? will give meadel

a. she will receive a refund of $278.

step-by-step explanation:

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.