Multiply
eg: 4(3+2)=20
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Yes, a mathematical expression can have no variables, but such an expression is usually not very useful. An example of a valid expression without variables is: 1+1=2
It is an algebraic expression
Yes. Expressions cannot be expressed without variables. There are numerical expressions for ex. 2 + 3 is an expression without variables.
The answer to the expression "1 7" is unclear as it is missing an operator (such as +, -, *, /) to indicate the mathematical operation being performed between the numbers. In mathematics, without an operator, it is difficult to determine the intended calculation. If you provide more context or specify the operation, I can give you the correct answer.
8 + x 40 is not a valid mathematical expression.