Morad and elias are car mechanics. morad can complete a certain task in x hours. elias can complete the same task in y hours. which equation correctly describes their combined hourly rate of work ? a) x+y=x+y b) 1/x + 1/y = 1/xy c) 1/x + 1/y = x+y/xy d) 1/x + 1/y = 1/x+y

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.