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Differentiate 5x^2 - 7x +9

The general rule for differentiation is multiply by the power and decrease the power by one. So if we take each term individually starting with 5x^2, and multiply by the power giving 10 then reduce the power...
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Answered by Rachael G. • Maths tutor
1929 Views

Describe the conducting system of the heart.

The pacemaker cells of the sino-atrial node in the right atrium generate an impulse.This impulse travels through the atria, causing depolarisation of cardiac muscle cells and atrial contraction.The impulse w...
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Answered by Calum P. • Biology tutor
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The formation of ammonia is an equilibrium reaction; N2(g) + 3 H2(g) <--> 2 NH3(g) the enthalpy of this reaction is negative. What can be done to increase the yield of products?

Using le Chatelier's principle that when a change occurs in a system at equilibrium the system will counteract the change to establish a new equilibrium we can answer this question. If the pressure is increa...
TD
4793 Views

How do you write "Evaluate the usefulness of the source" questions?

This is a 6 mark question, which I answer using an anagram which helps you to remember each of the points you need to include to achieve full marks. The anagram I use is: TACL which stands for Time, Author, ...
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Answered by Emma L. • History tutor
2880 Views

Your school/college has organised an exchange trip to France. As part of the programme, you spend several days staying with a French family. On your return you are asked to write an account of your experience in French for your school/college website.

Pendant l'été, je suis allé à la France pour un voyage d’échange avec ma classe, beaucoup de mes amis ont voyagé avec moi cependant j’ai passé le semaine avec un famille français. La maison de la famille éta...
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Answered by Elizabeth B. • French tutor
1397 Views