What is the pattern rule 1,4,13,40,121

(x * 3) + 1

Step-by-step explanation:

(1 * 3) + 1 = 4

(4 * 3) + 1 = 13

(13 * 3) + 1 = 40

etc

3x + 4y -25 =0 represents the amount of change sianna should recieve

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.