Answer
$20$ Pa
Work Step by Step
$\Delta p$ basically means "change in pressure." Hence, it is the difference (later minus before) between the measured magnitudes.
$$\Delta p = 120 Pa - 100 Pa = 20 Pa$$
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)
by Knight, Randall D.
Published by
Pearson
ISBN 10:
0133942651
ISBN 13:
978-0-13394-265-1
Chapter 19 - Work, Heat, and the First Law of Thermodynamics - Stop to Think 19.1 - Page 517: 1
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