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<15,-21>

Step-by-step explanation:

u = <3, -1>

v = <-6, -6>

9u + 2v

9 <3, -1>+2 <-6, -6>

<27, -9> + <-12,-12>

<15,-21>

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.