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In order to work with sequences and series, there are formulae that you should memorise. Do you know them? When you think you know, move the mouse over the question mark to check.

Here are some examples of arithmetic series:
0, 2, 4, 6, 8, 10, 12, ...
13, 10, 7, 4, 1, -2, -5, ...
0.7, 1.4, 2.1, 2.8, 3.5, 4.2, ...
In general an arithmetic series has first term a and common difference d.
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jsMath
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You can get a better display of the maths by downloading special TeX fonts from jsMath. In the meantime, we will do the best we can with the fonts you have, but it may not be pretty and some equations may not be rendered correctly.

Glossary

series

the sum of terms in a sequence

union

The union of two sets A and B is the set containing all the elements of A and B.

work

Equal to F x s, where F is the force in Newtons and s is the distance travelled and is measured in Joules.

Full Glossary List