Answer
$1621$
Work Step by Step
$M=1000
\\D=500
\\C=100
\\X=10
\\I=1$
Thus,
$MDCXXI = 1000+500+100+10+10+1= 1621$
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 4 - Number Representation and Calculation - 4.4 Looking Back at Early Numeration Systems - Exercise Set 4.4 - Page 241: 23
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