Top answers

How do I form the passive voice?

Contrary to popular belief, the passive is a 'voice' not a tense, but it can be used in different tenses - the present, past or future for example. Confusing huh? So when should you use the passive voice? It...
PP
Answered by Penny P. • German tutor
7712 Views

How do I know whether I should use -er, -é(e/s) or -ez?

For many people (including, unfortunately, French people), this is a recurrent mistake, despite the fact it can be avoided easily. Those endings are used for different things. The first one, '-er', is the in...
SO
Answered by Solweig O. • French tutor
19085 Views

What is integration by parts, and how is it useful?

"Integration by parts" is one of several methods in our arsenal that we can use to integrate a function f ( x ). It involves expressing f ( x ) as the product of two other functions, which I will c...
AJ
Answered by Alexander J. • Maths tutor
3710 Views

What are the roots of 3x^2 + 13x + 4 ?

To find the roots, we solve the equation 3 x 2 + 13x + 4 = 0. We could try factorising the equation, which gives us (3x + 1)(x + 4) = 0 So the roots are x = -1/3 and x = -4. Alternatively, we could use the q...
NB
Answered by Nicholas B. • Maths tutor
11234 Views

Why do volcanoes and earthquakes occur at destructive plate margins?

Destructive plate margins are where a plate of higher density is subducted, or forced underneath, another, less dense plate. This occurs due to convection currents in the mantle. These are caused by radioact...
LS
Answered by Laura S. • Geography tutor
42174 Views