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a x 10^4 + a x 10^2 = 24 240 where a is a number. Work out a x 10^4 - a x10^2 Give your answer in standard form.

From first principles: ax10^4 is the same as a0000. ax10^2 is the same as a00 So, a0000 a00 a0a00 If we look at this pattern and compare to the number in the question: a0a00 | | 24240 the a0 corresponds to t...
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Answered by Joe B. • Maths tutor
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What is a convection current?

A convection current is the way that heat is transferred throughout a fluid. By fluid, we mean a liquid or a gas, where the molecules are free to move. Imagine a cup of water being heated from the bottom. Th...
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Answered by Luke C. • Physics tutor
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Explain the disadvantages of an ageing population for one country.

Using a case study already researched, first name the country and give an outline of how the population is ageing with a few brief statistics. Depending on the marks for the questions give 3-4 impacts of an ...
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Answered by Annabel G. • Geography tutor
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Explain the causes and effects of increasing levels of carbon dioxide in the atmosphere

Carbon dioxide is a greenhouse gas that is produced through the burning of fossil fuels such as coal, oil and gas. Increased demands for electricity, heating and cars etc. means that more fossil fuels are be...
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Answered by Lydia K. • Biology tutor
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Choose a time in your life when you made a new discovery, and write a magazine article explaining how it impacted you.

Focus on the genre of a magazine article - a relevant title aimed at whichever age group you choose to focus on (can be humourous or informative) as well as the page layout expected with an author's name. La...
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