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A math expression is a symbol or combination of symbols that represents a quantity or a relationship between quantities.
In math a letter is a variable and it can be any number.
If you mean the symbol of a triangle, in math and science a triangle stands for change in
You add and then solve the math
dami
Nobody 'invented' it... letters are often used in maths to signify an unknown quantity.
A variable is representative of an unknown quantity in a problem.
it is a symbol that stands for a number(mabe)
A math expression is a symbol or combination of symbols that represents a quantity or a relationship between quantities.
In math a letter is a variable and it can be any number.
A root in math is a number that, when substituted for the unknown quantity in an equation, will satisfy the equation
If you mean the symbol of a triangle, in math and science a triangle stands for change in
If you mean a variable then it is an unknown quantity that can represent many values until its specific value is determined usually by solving an equation.
You add and then solve the math
It is (or they are) unknown!
The symbol that you describe seems to be the greek letter Phi. It is normally used to indicate a variable that is an angle, just as x is used to indicate a variable that is a numeric quantity.
A capital A is usually used as a symbol for area in math.