7r-9s+2r
evaluate for the following expressions for r=7,s=-2 and t=5

91

Step-by-step explanation:

7(7) - 9(-2)+2(7)

=142+49

=91

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.