CUVE Writing an Algebraic Expression Write an algebraic expression to model the unknown number situation. Which statements are true? Select all that apply. the difference of a number and seven You can replace "a number" with a variable to represent an unknown value. Subtraction Words decreased by 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. difference fewer The correct expression is 7-n. less than subtract​