LESSON 1.3 Variables and Expressions. 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.

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Presentation transcript:

LESSON 1.3 Variables and Expressions

Getting Started… 1. Round to the nearest ten: 7, ___ or _____ ,910 > >

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

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 x 6y

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

÷ 2 18 ÷ (4 + 5) ÷ ÷

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) $ $6.37

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