50 Chapter 1 The Set of Real Numbers Answers 11. 10 4 162; 12 1 5 12. 122; 2 2 13. 60 1602; 0 14. 32.00 2.15 (3.28); $30.87 per share c. The sum of 12 and its opposite Add. 12 1122 0 12 Skill Practice Write as an algebraic expression, and simplify the result. 11. The sum of 10, 4, and 6 12. Negative 2 added to 13. 60 added to its opposite 4. Applications Involving Addition of Real Numbers Adding Real Numbers in Applications Example 6 a. It is common for newborn infants to fluctuate in weight. Elise and Benjamin’s baby lost 7 oz the first week and gained 10 oz the second week. Write a mathematical expression to describe this situation and then simplify the result. b. A student has $120 in her checking account. After depositing her paycheck of $215, she writes a check for $255 to cover her portion of the rent and another check for $294 to cover her car payment. Write a mathematical expression to describe this situation and then simplify the result. Solution: a. A loss of 7 oz can be interpreted as 7 oz. The infant had a net gain of 3 oz. 7 10 3 120 215 12552 12942 b. Writing a check is equivalent to adding a negative amount to the bank account. Use the order of operations. Add from left to right. The student has overdrawn her account by $214. 335 12552 12942 80 12942 214 Skill Practice 14. A stock was priced at $32.00 per share at the beginning of the month. After the first week, the price went up $2.15 per share. At the end of the second week it went down $3.28 per share. Write a mathematical expression to describe the price of the stock and find the price of the stock at the end of the 2-week period. TIP: The sum of any number and its opposite is 0. ⎧⎪⎪⎨⎪⎪⎩ ⎧⎪⎪⎪⎨⎪⎪⎪⎩
miller_beginning_intermediate_algebra_4e_ch1_3
To see the actual publication please follow the link above