What is an algebraic expression for, the sum of s and t ?

Step-by-step explanation:

The sum is the result obtained from adding two or more values together.

The sum of s and t is the result obtained from adding s and t together.

s + t

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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.