Q: Is x² a variable or just x?

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The number that represents the variable in-7 x greater than or equal to 18 can be a lot of numbers . In -7x x is the variable and its minimum value to make it greater than 18 is -3 . -7 * -3 = 21 which is greater than 18.

A variable is a letter that acts as a number. For example, x is the most common variable. You might see an equation y = 2x + 3 . The variables in this are x and y.

There is no specific name. If the numerator and denominator are polynomials in the variable then the question describes an algebraic fraction. But there is no reason at all to assume that they are polynomials. There is no specific phrase that describes sin(x)/x, for example.

The "x" or "y" or abcdefg or any letter after a number is called a variable, and can be used to represent any number.

The expression is 9*x.

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x isn't a value, just a variable standing for a number

Just the number, for example: 7x the variable is 7. The variable is the number without the variable(x,y,z, etc.)

The variable c times the variable b simply equals cb. Just as the variable x times the variable y would equal xy, and so on.

A variable times the same variable is called a square of that variable. For example, if the variable is x, then x multiplied by x is written as x^2, which is read as "x squared."

It can be a new variable eg x*y = xy. Or it can be a constant eg x is a variable then 3/x is another variable. x*(3/x) = 3, which is a constant.

Often the x variable is the independent variable and the y variable depends on x.

That would depend on the value of the variable x otherwise it is just: 4+x

Variables are just letters to solve for the unknowns. ex of a variable: 4x-6 = 16 x is a variable in this case, so we solve for it 4x = 22 x = 11/2

Not always. It could be a constant. For example x is one variable, and y = x-2 is another variable. Then x - y = x - (x-2) = 2.

The variable in 14x is x.

X

x and y is a it replaces an unkonwn number so they just say x and y