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In a sale, normal prices are reduced by 18%. The sale price of an umbrella is £25.83. Work out the normal price of the umbrella.

Once again break down the question: All prices are reduced by 18%, so sale price is 100% (normal price) - 18% (sale price) = 82%. As we know what the sale price is, but we DO NOT KNOW the normal price we can...
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Answered by Kenji S. • Maths tutor
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Explain the four levels of protein structure, indicating the significance of each level

There are four levels to a protein's structure:Firstly, the primary structure which is the sequence of amino acids linked by peptide bonds. This level determines the type/function of the protein by influenci...
SS
Answered by Shivani S. • Biology tutor
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What is the root mean square voltage of an alternating current?

Since the voltage of alternating current, by definition, changes over time, it is helpful for physics to describe it using a sinusoidal curve. In this case, the amplitude of that sine curve becomes is what w...
MB
Answered by Mate B. • Physics tutor
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Describe the similarities and differences between the processes of diffusion and osmosis. [4]

Both diffusion and osmosis are processes concerning the movement of molecules from an area of high concentration to an area of low concentration, along a concentration gradient. Any type of molecule can move...
RN
Answered by Ruth N. • Biology tutor
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Simplify: 5a + 2 – a + 9

For this question, we need to simplify the expression, and to do this, we first should rearrange the way it is written, so similar (or like) terms are next to each other. So in rearranging the expression we ...
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Answered by Sindhu R. • Maths tutor
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