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Q: How would you write the product of a number z and 4 as a variable expression?

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Assuming you call your number "n", the expression would be "14n". You can replace "n" with whatever variable you want to use.

If the number is represented by variable x, then twice the number is represented by 2x.

2f

If you call your number x, the expression would be 5x.

it is the number you would use to solve the problem

Yes. A variable by itself, or anything that contains a variable, would be a variable expression (unless the variable cancels out, as in "x - x", which always has the same value).

25x= 5

2 would be the coeeficient the coefficient is the number before the variable

It would be: 6/x whereas x is the unknown variable

That would be the expression 8x + 3.

A variable expression is an expression which contains variables(symbol that represents a certain value). For example, 4a-90. 4a-90 would be the expression an a is a variable

No. "x" is the variable. Any calculation involving a variable would be an EXPRESSION.

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