7(1 - 3x) + 8 = -3(4 + 4x)

3

Step-by-step explanation:

Distribute first to get 7-21x+8= -12-12x

Next, do your like terms to get 15-21x=-12-12x

Match your variables by doing the opposite of -21x. Then add it to -12x.

15=-12+9x

Then just solve. :)

2/5

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.