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Lesson 1.3: Order of Operations Essential Question: How do you use Order of Operations to evaluate equations?

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Key Vocabulary Order of Operations: the rules of which calculation comes first in an expression. Please Excuse My Dear Aunt Sally

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Example 1 There are about 2,000 plants in each of the 50 stars of this flag. There are about 64,100 plants in each of the 7 short stripes and 106, 700 plants in each of the long stripes. The blue region contains about 198,900 plants. About how many plants are there total?

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Example 2

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Example 3 Evaluate the expression when x=2 and y=5 a. 4(x+y) b. 3(x+y)²

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Example 4 You buy a pattern and enough material to make two pillows. The pattern costs $5. Each pillow requires $3.95 worth of material and a button that costs $.75. Find the total cost. Total cost= cost of pattern+ # of pillows· cost of each pillow

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PS Algebra I. when simplifying an expression, this is the procedure you must use: 1) simplify any grouping symbols found within the expression (grouping.

PS Algebra I. when simplifying an expression, this is the procedure you must use: 1) simplify any grouping symbols found within the expression (grouping.

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