Answer
See below.
Work Step by Step
If $\sim(p\lor q)$ is true, then $(p\lor q)$ is false, thus neither of $p$ and $q$ can be true, thus both $p$ and $q$ are false.
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 3 - Logic - 3.3 Truth Tables for Negation, Conjunction and Disjunction - Exercise Set 3.3 - Page 150: 100
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