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Express 4x/(x^2-9) - 2/(x+3) as a single fraction in its simplest form.

In order to add or subtract terms to/from each other, both of their denominators (the number on the bottom of the fraction) must be the same. In this case they are different, so the first step is to try and ...
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Answered by Alex E. • Maths tutor
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Explain the basic Principles of Medical Ethics

Medical ethics is based on four main principles, which are important to remember when discussing through ethical scenarios. The principles are: Autonomy - this is the right of the patient to make their own d...
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The equation for the reaction of carbon and nickel dioxide is: NiO + C ----> CO + Ni Calculate the percentage atom economy of this reaction to produce nickel to 3 significant figures.

Using a periodic table, you can find that: Molecular mass of carbon: 12Molecular mass of nickel: 59Formula mass of nickel oxide: 75 (=59+16) Mass of all the reactants = 12+75=87Mass of the product we want (n...
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Answered by Emma N. • Chemistry tutor
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Complete the square for the following equation: 2x^2+6x-3=0

2x 2 +6x-3=0To begin, we need to make sure x 2 is by itself, meaning that we divide the whole equation by 2. So from here we get (2x 2 +6x-3=0) / 2 = x 2 +3x-3/2=0. Now as we have got the x 2 on its own, we ...
Answered by • Maths tutor
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What is a rhetorical question

A rhetorical question is a question you ask someone, but you do not expect or need an answer. Often you know the answer to the question already. They are often used in emotive writing to emphasise particular...
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Answered by Maddie M. • English tutor
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