In this video we look at the basics of algebra, focusing on the notation that is used.
In algebra we use symbols to represent numbers. These symbols are called variables. Some reasons for using symbols instead of numbers is that the symbols, or variables, can represent unknown quantities and for showing formulae like the area of a circle.
Instead of writing a X b we remove the multiplication sign and just write ab instead. Two letters next to each other or a number and a letter, means those things are multiplied together.
We use a curly x for the letter because otherwise it looks like a multiplication sign.
Instead of the division sign, in algebra we usually write it as a fraction. Numbers are usually left as fractions rather than as decimals.
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The study of finches led to the development of one of the most important scientific theories of all time.
In December 1831 a naturalist called Charles Darwin boarded the HMS Beagle, bound on a surveying voyage of South America. Whilst the ship and crew carried out coastline surveys, Darwin was fre
Learn the basics about halogenation within the alkanes and alkenes part of organic chemistry.
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This video is part of 'Chemistry for
The Mean | Statistics & Probability
Bob is training for a race and is timing himself to check he’s getting faster.
Times (in minutes):
51 48 45 44 47
50 44 47 45 43
49 44 43 44
His times are a bit inconsistent.
He wants to find his average, to get a better understanding of what time he is likel