Answer :

The expression is 3n - 11.

What is an expression?

One mathematical expression makes up a term. It might be a single variable (a letter), a single number (positive or negative), or a number of variables multiplied but never added or subtracted. Variables in certain words have a number in front of them. A coefficient is the number used before a phrase.

Let the number is n.

The according to the question:

Three times a number = 3n.

Then, less than 11,

3n - 11.

Eleven less than three times a number.

3n - 11.

Therefore, the expression is 3n - 11.

To learn more about the expression;

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3x-11 is the equation