The area of a square is (x² + 8x + 16) cm?. Find the length of its side. (A) (x - 8) cm
(B) (x-4) cm (C) (x + 4) cm (D) (x + 2) cm

(C) (x +4)

Step-by-step explanation:

(x² + 8x + 16)  = x² + 4x + 4x + 16

x² + 4x + 4x + 16 = x² + 4x + 4x + 4²

x² + 4x + 4x + 4² = (x + 4)(x + 4)

*You can also plug in a value for x to check.

21

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.