Write an algebraic expression to model the unknown number situation. the difference of a number and seven A 1-column table with 5 rows. Column 1 is labeled Subtraction Words with entries decreased by, difference, fewer, less than, subtract. Which statements are true? Select all that apply. You can replace “a number” with a variable to represent an unknown value. You can replace “difference” with a division sign. You can replace “difference” with a subtraction sign. You can replace “seven” with 7. The correct expression is n – 7. The correct expression is 7 – n.