Are the two triangles similar? how do you know?

Yes by AAA

Step-by-step explanation:

we know that

If two triangles are similar, then the ratio of their corresponding sides is equal and the corresponding angles are congruent

In this problem

-----> by vertical angles

------> given problem

Remember that the sum of the internal angles of a triangle must be equal to  

so

therefore

The triangles are similar by AAA

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.