Yes.
It is a numerical expression.
3 + (8/4) = 5
Yes.
The numerical result of decreasing ten by seven is three.
6-3
5.8 is a numerical expression.
It's a quadratic trinomial expression in 'x'. Its numerical value depends on the numerical value of 'x'. There are an infinite number of possibilities.
3 x 7 = 21
A numerical expression is an expression that uses number. For example, if a teacher told you to write four plus six subract two , you would simply write it in number form. 4+6-2.
A Numerical Expression is an expression only using numbers.
It would be possible to answer the question if it was written in English. What do you really want to know?
A variable expression includes variables.