It is a lot of numbers and letters, combined together with various mathematical operations and functions. Operations such as addition, subtraction, multiplication division, exponentiation etc; functions such as trigonometric ones, logarithms, factorials, etc.
An expression cannot have an equals sign (or a less than or more than sign) because then it becomes an equation (inequality).
So 3x2 + 2y/sin(x) - 23-x is an expression.
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> - greater than < - less than
Maths is important because it has to be used in everyday life like if you were a pharmasist you have to look at the liquid amount!
Sex Is Like Maths Because You Add The Bed Subtract The Clothes Divide The Legs And Then Multiply?
A parameter is like a limit or a specification.