Mark is six years younger than his sister Teri. Their combined ages equals 86. How old are Mark and Teri? Mark's age = x
Teri's age = y​

Mark is 30 and Teri 36

Step-by-step explanation:

I suck at explaining things but here's and answer :)

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.

i dont know the answer but here's a picture of a dog