#### Answer

We go to the beach if and only if the temperature is above 85°, and we 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 ᴧ q
By grouping in parenthesis based on the order of dominance, we find:
r ↔ (p ᴧ q)
(p ᴧ q) : the temperature is above 85°, and we finished studying.
r ↔ (p ᴧ q): We go to the beach if and only if the temperature is above 85°, and we finished studying.