Answer
$5.09 \ billion$
Work Step by Step
The human population will increase by
$$
11.20-6.11=5.09 \ billion
.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 1 - Section 1.10 - Addition and Subtraction of Decimal Fractions - Exercises - Page 63: 71
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