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A complex number is one that is made up of a complex and real part, they can all be written as:
a+bi, where a and b are real numbers.
The thing that makes the number "complex" is "...

A moment is the turning force that is exerted at right angles (perpendicular) to a pivot.
For example, on a see-saw, the moments would be the forces exerted on each end by the people sat on it. If th...

Standard form (sometimes called standard index form), is a way of writing out numbers.
It is especially useful when it comes to VERY large or VERY small numbers, which normally would take lots of tim...