3. Variable: Is a quantity that can change or vary. Mathematicians use letters to represent variables. Constant: A quantity that does not change. 6 + 2x Expression: Is a mathematical phrase involving constants, variables, and operation symbols.

4. Evaluate each expression for x=1, 2, and 3. xX + 5 1 2 3

5. x11 – x 3 4 5 Evaluate each expression for x=3, 4, and 5.

6. x4x + 8 6 7 8 Evaluate each expression for x=6, 7, and 8.

7. x12/x + 2x 2 4 6 Evaluate each expression for x=2, 4, and 6.

8. xx² + 12x18/x 1 2 3 Evaluate each expression for x=1, 2, and 3.

9. Evaluate each expression x= 3, 4, 5. 1.7x 2. 15-x 3. 60/x 4. x + 23

10. Evaluate each expression for n = 5. 1.9n – 9 2.(3n + 5n)10 3.12 x n/2

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