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One advantages of hormonal contraception are that, when used properly i.e. taken on time and regularly, they are more effective than physical barrier contraceptives such as condoms or diaphragms. However ...

'Describe' questions are looking for historical, contextual, knowledge - tailored specifically to the question.For example the examiner will have hundreds of papers to mark and they are looking for specif...

Hydrogen fuel cells are really important as they can be used to power electrical cars, so it's something that a lot of scientists are looking into at the moment. We need to balance this equation, so we ne...

(This question is from the Edexcel Higher GCSE paper 2018) As BC is a tangent to the circle, we know that angle OBC must be a right angle (90 degrees)We also know that lines OA and OB are both the same le...

The equation is in the form ax^2 + bx + c, where a = 1, b = 10 and c = 2To complete the square, we write (x + b/2a)^2 + c - (b/2a)^2So here we would have (x + 5)^2 + 2 - 25Therefore completed square form ...