# Chapter 5 - Number Theory and the Real Number System - 5.2 The Integers; Order of Operations - Exercise Set 5.2 - Page 270: 120

Getting less than 6 to 8 hours of sleep per night and smoking will shrink one's life span by $16$ years.

#### Work Step by Step

Getting less than 6 to hours of sleep per night shrinks one's life span by 1 year. The number represents this is $-1$. Smoking cigarettes shrinks one's life span by 15 years. The number that represents this is $-15$. The final effect on one's life span in doing the two can be found by adding the two numbers together: Effect on one's life span $=-1 + (-15) = -16$ Thus, getting less than 6 to 8 hours of sleep per night and smoking will shrink one's life span by $16$ years.

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