1. On a 50-foot roll of cable, 15 ft are left. How many feet of cable were used? Adding and Subtracting Rational Numbers COURSE 3 LESSON 4-4 3434 Let t = the amount used. Wordsamount left + amount used = original amount 3434 Equation15 +t=50 4-4

2. (continued) Adding and Subtracting Rational Numbers COURSE 3 LESSON 4-4 Subtract 15 from each side.t = 50 – 15 3434 3434 The amount of cable used was 34 ft. 1414 4-4 15 + t = 50 3434 Rewrite 50 as 49 +, or 1. Subtract.t = 49 – 15 = 34 4444 3434 4444 1414

3. Adding and Subtracting Rational Numbers Find each sum or difference. 1. – 2. + 3. – 4.4 – 1 5.It snowed 2 in. on top of 4 in. of snow already on the ground. How deep is the snow now? 1313 7 in. COURSE 3 LESSON 4-4 8989 5959 4545 2323 7878 1212 5656 1414 3838 7 15 1 7 12 3 4-4 1212 1212