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Lesson 1-3 Example 1 Use Order of Operations Find the value of 7 + 3 6. 7 + 3 6 = 7 + 18 = 25 Multiply 3 and 6 first. Add 7 and 18. Example 2 Use Order of Operations Find the value of 18 – 7 + 4. 18 – 7 + 4 = 11 + 4 = 15 Subtract 7 from 18 first. Add 11 and 4. Example 3 Parentheses and Exponents Find the value of 36 9 + 12 (7 – 5). 36 9 + 12 (7 – 5) = 36 9 + 12 2 = 4 + 12 2 = 4 + 24 = 28 Example 4 Parentheses and Exponents Find the value of 4 × 33 + 5. 4 × 33 + 5 = 4 × 27 + 5 = 108 + 5 = 113 Find 33. Multiply 4 and 27. Add 108 and 5. Subtract 5 from 7. Divide 36 by 9. Multiply 12 by 2. Add 4 and 24. Example 5 Real-World Example Max buys 3 videos, 2 DVDs and 2 CDs at an electronics store. Write an expression for Max’s total cost. Then find his total cost without tax. Prices at Electronics Store video DVD CD Item 15 25 20 Cost ($) To find the total cost, write an expression and then find its value. Words Expression cost of 3 videos plus cost of 2 DVDs plus cost of 2 CDs 3 $15 + 3 $15 + 2 $25 + 2 $20 = $45 + 2 $25 + 2 $20 = $45 + $50 + 2 $20 = $45 + $50 + $40 = $135 The total cost without tax is $135. 2 $25 Multiply 3 and 15. Multiply 2 and 25. Multiply 2 and 20. Add 45, 50, and 40. + 2 $20