B. Rewrite the following phrases in algebraic expressions and identify the variable.

1. Twelve increase by a number
2. Eighteen less than a number
3. Forty divided by a number
4. A number less than a product of two and eight
5. Twenty-nine added to a number
6. Seventy-five decreased by a number is thirty-nine
7. A number less than the product of six and four is eighteen
8. The sum of a number and fifty-seven is sixty-five​