Answer
If we do not go to the beach, then it is not true that both the temperature is above 85° and we have finished studying.
Work Step by Step
p: The temperature is above 85°.
q: We finished studying.
r: We go to the beach.
We write each symbolic statement in words and order based on dominance.
~r → ~(p ∧ p)
~(p ∧ p): It is not true that both the temperature is above 85° and we have finished studying.
~r → ~(p ∧ p): If we do not go to the beach, then it is not true that both the temperature is above 85° and we have finished studying.