# Introduction to Abstract Algebra : Rings and Fields by Rachel Quinlan

By Rachel Quinlan

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10 18 ft 102. Paul Beaulieu’s favorite recipe for barbecue sauce calls for 2 13 cups of tomato sauce. The recipe makes enough barbecue sauce to serve seven people. How much tomato sauce is needed for one serving? 103. A cake recipe calls for 1 34 cups of sugar. A caterer has 15 12 cups of sugar on hand. How many cakes can he make? 104. Kyla Williams needs 2 14 yd of fabric to cover a chair. How many chairs can she cover with 23 23 yd of fabric? 105. It takes 2 38 yd of fabric to make a costume for a school play.

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A) 8 (b) - 4 - 2 + 1- 42 = - 1| - 2 | + | - 4 |2 = - 12 + 42 = - 6 38 CHAPTER 1 The Real Number System Adding Numbers with the Same Sign To add two numbers with the same sign, add the absolute values of the numbers. The sum has the same sign as the numbers being added. Example: - 4 + 1- 32 = - 7 NOW TRY EXERCISE 2 Find the sum. - 6 + 1- 112 EXAMPLE 2 Find each sum.