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Both tenses express an action that was done in the past. However, the imperfect is used to speak about a habit, something that is done often and regularly. The perfect tense is used to speak about a singl...

Use the intro to briefly explain what 'equality of outcome' means (elimination of class system). Then mention the different kinds of socialists that exist (Marxist, democratic socialist, social democrats,...

First, she should filter the mixture using a filter funnel and filter paper to remove the sand. Then, she should distill the remaining solution, using a bunsen burner, a distillation column and a condensi...

 Shifts in the supply and demand curves are only caused by changes other than price changes. 

Price changes only cause a movement along the demand or supply curve. This is because at higher price l...

We can see that the function is a sum of three terms so we can deal with each term separately and add them up. The term 8x³ and 5 are relatively straightforward and follow the standard rules fo...