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The Past Perfect is used to describe events that happened before another event in the past. It is constructed like the present perfect tense, except that "haben" or "sein" is in its...

When you differentiate, you multiply by the old power and decrease the power by 1. If the expression has a constant in it, this differentiates to 0. 

So the answer is 3y^(3-1) + ...

You want two numbers that multiply to give 2 and add to give 3. Looking at factors is always easiest, so start by listing pairs of numbers that multiply together to give 2. There are ...

With AR verbs, first take off the AR from your infinitive to get the stem of the verb, then add the imperfect endings as follows:Yo .....abaTú .....abasél/ella/usted .....abaNosotros ábamosVosotros abaisE...

Magnitude- an earthquake higher up the richter scale is more potent so more likely to cause economic damage and a higher death/ injury toll

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