Q: Which word phrase could represent the variable expression 2p 3?

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the variable represents any number that the P could be

There could be a variable in the numerator which is not defined. For example, [tan(x)]/3 has no variable in the denominator but the expression is not defined for x = pi/2, for example (90 deg).

n - 8 is the expression for the difference of eight and a number.'Number' is a variable, so the variable must be a letter (in this case, 'n'). 'The difference' is going to be the subtraction symbol that is in between the 'number' and eight, so it must be n - 8. It could, of course, be 8 - n.

With no context it is difficult to be sure but I suggest that n is a counter: a variable that goes 1, 2, 3, 4, ...and x, unfortunately, represents multiplication. I say unfortunately because the accepted symbol nowadays is * rather than x.So the expression is to multiply a number by its predecessor. The expression could represent the number of permutations of two objects selected from n distinct objects.

-27 is a number. Through the Reflexive Property of Algebra, -27=-27. You could also represent it as an expression such as 0-27 or -28+1.

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It could represent an unknown variable in an expression or an equation.

No, it could be a qualitative variable.

the variable represents any number that the P could be

It could be: 21n2-4

That could be a 'coefficient'.

It could represent a vector.

Could represent a vector P. Or the average (mean value) of a variable P.

There could be a variable in the numerator which is not defined. For example, [tan(x)]/3 has no variable in the denominator but the expression is not defined for x = pi/2, for example (90 deg).

Typically m is used to represent Mass; though, as it is a variable, m could be used for anything.

"What number" here is a number of unknown quantity, or what some might call a variable (as its value can vary). And in algebra, what is arguably the most common symbol we find in use is x.In this case, 300 of x is 180 as was asked in the question.

In algebra, variables are represented by letters such as x. A variable could be any number. That number is the "value" of the variable. In an expression, you can choose a number to put in for x, and simplify to get a number which is the value of the expression. In an equation, you can solve for the value of x, which will be the value of x which makes the equation true.

n - 8 is the expression for the difference of eight and a number.'Number' is a variable, so the variable must be a letter (in this case, 'n'). 'The difference' is going to be the subtraction symbol that is in between the 'number' and eight, so it must be n - 8. It could, of course, be 8 - n.