It is an expression.
Numerical Expression
They are terms of an expression or an equation
That type of sentence is called a mathematical expression.
Grouping symbols are symbols such as parentheses or brackets, that indicate that the operations within them should be done first. When an expression contains more than one pair of grouping symbols, the computations in the innermost grouping should be done first.
Evaluate the innermost grouping symbol first and make your way outwards.
Grouping symbols are parentheses such as {}, (), []. They need to be evaluated before other operations. If there are a number of nested parentheses, they must be evaluated starting with the innermost.
an expression
A
Yes. You must perform the operations inside the absolute value first.
I think that it is chemical formula.
You get different values for an expression by changing the placement of the grouping symbols.
Well in math an expression is a finite combination of symbols that is well-formed according to rules that depend on the context. Symbols can designate numbers (constance), variables, operations, functions, and other mathematical symbols, as well as punctuation, symbols of grouping, and other syntactic symbols. The use of expressions can range from the simple: 3 + 5 it is as easy as 1 2 3 but as you get older your math expressions will get harder.