letters used in math r called variables. it could mean any number, fraction, decimal, or %.
eg.
x divided by 3 = 5 answer: x = 15
x times 20 = 100 answer: x = 5
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Whatever 'x' is, subtract 3 by x.
It can represent multiplication or a number that is the one which we are looking for.
It is the multiplicative identity. This means that for all numbers x, x * 1 = 1 * x = x
product means x in math terms so 10x10=100
Perpendicular means that two lines intersect like an X but its just perpendicular