Please help only this

b = 86

Step-by-step explanation:

49 + b + 45 = 180           Combine like terms

b + 94 = 180                   Subtract 94 from both sides to isolate b

b = 86

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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.