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What is the subjunctive?

The subjunctive is a 'mood', like a tense, it changes the conjugation of the verb. It is used after certain phrases such as 'il faut que' (it is necessary that) and bien que (although) e.g. 'il faut que j'y ...
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Answered by Alice H. • French tutor
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what is the derivative of x?

Apply differentiation through first principles and understand the first principles to find the derivatives of common functions.
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Answered by Yashvini S. • Physics tutor
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What is a titration reaction in acid-base chemistry?

A titration reaction is used to calculate the conentration of an acid or alkali. The two solutions are combined, one of known and one of unknown concentration. When combined the hydrogen ions from the acid a...
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Answered by Hatem S. • Chemistry tutor
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Find the general solution to y''+2y'-3y=x

y''=d 2 y/dx 2 , y'=dy/dx for ease of writing First off split the full equation into th homogeneous equation and the particular function. The homogenous equatiion is when our collection of y, y', y'' are on ...
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What is the difference between the preterite tense and the imperfect tense?

The preterite is used to describe events that happened only once and have finished. e.g. Antonio hizo sus deberes = Antonio did his homework (only once) The imperfect, on the other hand, is used to describe ...
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Answered by Ed P. • Spanish tutor
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