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Using integration by parts by letting u=x and dv/dx=e^-x. this implies that du/dx=1 and v=-e^-xThe By Parts formulae is u.v - integral(v.du/dx) = -xe^-x - in...

The 'Perfect Tense' is made of two parts: The 'AUXILIARY' (form of avoir/ être) + the 'PAST PARTICIPLE'
You pick the auxiliary according to the subject (ie. if you want to use 'nous' then the auxili...

This is a relatively complicated mechanics question requiring the student to put aside their initial assumption and work with the actual meaning of average speed. In order to do this the student must find...

When assessing this question, it is worth taking into account the natural resources and geographic factors which gave Lenin's government an inherent advantage. A good starting point for this is that the t...

It's always helpful to draw a diagram beforehand.Since we know the area of the circle is (49π)cm², we can work out the radius using A=πr² . Rearranging, we get r = 7cm. Add this info...