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Q: An expression that contains at least one variable?

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A constant is not a variable at all, and none of its factors was a variable. It is constant.

A nominal variable is one where observations are classified to categories eg small, medium and large for t-shirts. A real variable is one that takes numerical values, such as shirt size 12, 14, 16 etc. A real value may be a continuous (as opposed to discrete) variable but the very act of recording the observation usually results in the continuous variable being replaced by a discrete one.

To interpret the coefficient of a dummy variable is to follow all of the steps of the equation that is being used as if the dummy variable was a real one.

It is any invertible function.

function.

Related questions

An algebraic expression is a type of expression that contains a variable or variables.

the answer is an algebraic expression!

An algebraic expression.

yes it should contain one variable or more.

That looks like the description of an EXPRESSION. However, an expression need not have "at least one operation"; a single number, or variable, is a perfectly valid expression.

alebraic expression! :p

it is a one-step equation

An algebraic expression.

The awnser is an algebraic expression!

Variable expression.

A variable expression has at least one variable in it (which is usually a letter that stands for an unknown number).

5+3x(7-2)

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