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Well, as with all STEP questions, each problem is unique. But with graphing problems there are some nice things you can do to help break down the problem. Firstly, ALWAYS DIFFERENTIATE, i cannot stress...

The perfect passive participle is found in the fourth column of principal parts tables. It is formed differently in each conjugation:

First: -atus (amatus)

Second: -itus/irr...

There's a nice trick here you can do, treat the equation as 1*ln(x) then intergrate by parts.

Differentiating ln(x) gives 1/x, while intergrating 1 gives x

So your left with...

The verb 'ser' meaning to be, is used for permanent situations or statuses. e.g. Pablo es un chico aburrido = Pablo is a boring boy. 

The verb 'estar' also means to be but it is used for ...