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Factors of a number are: numbers that can be multiplied (by a whole number/ integer) to make the original number. For example, 6 is a factor of 42, because 6 can be multiplied by 7 to make 42.

If a source is reliable, then what it tells us is likely to be accurate and very close to the truth of what actually happened. In order to determine the extent of a source's reliability, it is easier t...

For two linear simultaneous equations, two algebraic methods can be used to find solutions.The first is elimination, which is usually a lot quicker. Elimination involves subtracting one equation form t...

A is a 2-digit square number. In order to find the smallest N number we want to find the smallest possible 2-digit sqaure number. To sqaure a number means to multiply this number by itself, e.g. the sq...

Ser is used in reference to things that are permanent, or unchanging - eg. Soy de Inglaterra. You can't change where you're from, so you need to use ser. Estar is used to describe temporary thing...