If -3+i is a root of the polynomial function f(x), which of the following must be a root of f(x)?

a. -3-i
b. -3i
c. 3-i
d. 3i

step-by-step explanation: 4 cause 2+2=4

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.