It is called "to evaluate" the expression.
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It is a combination of numbers and variables, linked together by mathematical functions. For example sqrt(2y/3*7.34*pi) where y is some variable. Given the value(s) of the variable(s) it is possible to evaluate (find the value of) the expression.
A binomial is an algebraic expression. It does not have an area.
The expression (9x) represents a mathematical term where the variable (x) is multiplied by the constant (9). It indicates that for any value of (x), you can find the product by multiplying that value by (9). This expression is often used in algebraic equations and functions to denote linear relationships.
Replace each variable in the expression by its value and then find the value of the expression.
Take the value of each variable in the expression and replace the variable by its value. Then do the math!