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Really...? Each number is 15 less than the number before it..... While this person is quite right in stating that you remove 15 to get the next number, the rule is usually an equation that can be used to find the nth term, rather than relying on a previous number. In this case a possible rule is '340-(15n)' 'n' being the letter used to substitute the term of the pattern. For example the 2nd term in this pattern is 310. Because BEDMAS states that we have to do brackets first, we multiply 15 by 2, which equals 30. 340-30 is 310, which is the 2nd term. We can apply this rule to every term in the pattern, so we know it works.
a rule used to solve math questions
I have never seen the term 'symbolic' used in this way. There are 4 methods used to solve a system of linear equations in two variables. Graphing, Substitution, Elimination, and Cramer's Rule.
The pattern rule for the given sequence is: starting with 0, add 3, then subtract 1, then add 2, then add 2, then add 3, then add 1, and the pattern repeats. This can be written as: +3, -1, +2, +2, +3, +1. This rule can be used to predict the next numbers in the sequence.
The steel rule is a measuring device. It is used to measure a piece of work such as engineering and is usually used just as if it were nothing more than a regular ruler.