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y = -63

Step-by-step explanation:

y - 15 = -78

Add 15 on both sides to get y alone:

y - 15 + 15 = -78 + 15

y = -63

y = -63

Step-by-step explanation:

Step 1:  Solve for y

y - 15 = -78

y - 15 + 15 = -78 + 15

y = -63

 y = -63

cut 138 centimeters off

step-by-step explanation:

250-112 = 138

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.