1. LESSON 1.3 Variables and Expressions

2. Getting Started… 1. Round to the nearest ten: 7,905.802 2. 8.92 ___ 8.915 or 8.915 _____ 8.92 7,910 > > 8.91 8.915 8.92

3. Definitions Numerical Expression: Contains only numbers and operational symbols. Variable: Its value can vary or change. Algebraic Expression: Contains at least one variable.

4. Translate into an Algebraic Expression The quotient of Fourteen and s The sum of twenty dollars and the sales tax x. The product of y and six. 20 + x 6y

5. Order of Operations P E M D A S arentheses xponents ultiplication ivision ddition ubtraction “Please excuse My dear Aunt Sally”

6. 3 + 5 8 + 6 ÷ 2 18 ÷ (4 + 5) 7 + 6 3 + 40 + 6 ÷ 2 3 + 40 + 3 46 18 ÷ 9 7 + 6 2 7 + 6 14 + 6 20

7. Evaluate each expression when x=2, y=3, and z=6 x z = x (y + 5) = If the sales tax rate is r and the purchase price is p, the amount of sales tax is rp. How much is the sales tax on a pair of shoes priced at $74.99 if the sales tax rate is.085? 2 6 = 12 2 (3 + 5) 2 816 $74.99.085 $6.37

8. Homework Page 20 – 21 5 - 27