Answer
See below.
Work Step by Step
This means that not $p$ and $q$, implies not $r$, thus a statement is: If the temperature is not above 85 degrees or we have not finished studying, then we do not go to the beach.
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 3 - Logic - 3.2 Compound Statements and Connectives - Exercise Set 3.2 - Page 133: 80
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