1. Translating Verbal Expressions COS: 5.0, 5.1

2. Vocabulary 1.A variable is a letter used to represent an unknown value. What is the root word for variable??? 2. A numerical expression includes numbers and operations. 3. An algebraic expression contains variables, numbers and operations.

3. Numerical Expressions Examples: 1.5 + 2 2.12 + 3 3.32 ÷ 8 4.7(4) Numerical expressions include numbers and operation symbols.

4. Algebraic Expressions Examples: 1.x – 4 2.2(5 + n) 3.b 2 Algebraic expressions include variables, numbers, and operation symbols. Remember: Variables are always written as lower case letters.

5. Let’s Practice! Rewrite these verbal expressions as algebraic expressions. 1. the sum of s and 12 s + 12 or 12 + s 2. the product of 15 and some number 15n

6. Let’s Practice! Continued 3. n to the seventh power n 7 4. 56 increased by twice a number 56 + 2n 5. four less than a number n - 4

7. Let’s write equations for these sentences. 1.Forty-three less than n is equal to 35. n – 43 = 35 2. Seven more than y is 13. y + 7 = 13

8. Equations WWhen you add an equal sign to an expression it becomes an equation. Expression: 2 + 6 Equation: 2 + 6 = 8