4(n++n) and 3n+9 are the two expressions shown below equivalent? explain

yes the expressions are the same

Step-by-step explanation:

4(n+3)-(3+n)

distribute

4n + 4*3 - 3 -n

4n +12 -3-n

combine like terms

3n +9

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.