Answer
You shrink your lifespan by $16$ years.
Work Step by Step
Getting less than 6 to 6 hours of sleeep per night takes away 1 year and smoking
cigarettes takes away 15 years. Add to find the solution
$-1+(-15)=-1-15=-16$
Introductory Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-805-X
ISBN 13:
978-0-13417-805-9
Chapter 1 - Section 1.6 - Subtraction of Real Numbers - Exercise Set - Page 72: 100
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