Answer
$A9$
Work Step by Step
We use the hexadecimal addition table 16.3 on page 560 to obtain:
$$
78+31=A9
.$$
Check, using decimals: $78_{16}=120_{10}, \ 31_{16}=49_{10} $
$$
120+49=169, \quad A9_{16}=10\times 16+9\times16^0=160+9=169
.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 16 - Section 16.8 - Addition and Subtraction of Hexadecimal Numbers - Exercise - Page 562: 7
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