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When do we use the 'passé composé' and 'imparfait' in French?

Both tenses refer to actions in the past. With the passé composé, we use this to describe an action which was completed in the past at a specific moment. For example: Je suis tombé (I fell). We use the impar...
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Answered by Katy H. • French tutor
2557 Views

How do vaccinations work? Why don't they cause disease?

A vaccine is a weakened form of the disease causing bacteria injected in to the patient. The person then develops immunity to that bacteria and so when they are infected with the bacteria, they are able to q...
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Answered by Acrisa K. • Biology tutor
3259 Views

Why can metals conduct electricity?

The outer shell of electrons in metals are delocalised, meaning they are able to travel freely around the metal. The negative electrons hold the positively charged metal ions together. The pool of delocalise...
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Answered by Acrisa K. • Chemistry tutor
9790 Views

Prove that one interior angle of a a regular octagon = 135 degrees

Regular octagon has 6 triangles within it. Total of interior angles in a triangle = 180 degrees So the total of interior angles within a regular octagon would = 180 x 6 (=1080). All angles in a regular octag...
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Answered by Acrisa K. • Maths tutor
12818 Views

Given the parametric equations x = t^2 and y = 2t -1 find dy/dx

The first step is to find dx/dt and dy/dt, this is done using standard differentiation rules giving the resultsdx/dt = 2t dy/dt = 2 The second step is to eliminate dt. This can be done by the multiplication ...
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Answered by Matthew H. • Maths tutor
10091 Views