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Propositional variables p, q and r refers: p: Grizzly bears have been seen in the area, q: Hiking is safe on the trail, r: Berries are ripe along the trail. Translate the following sentences to logic: Grizzly bears have not been seen in the area. Hiking is safe if and only if grizzly bears have not been seen in the area. It is not safe to hike on the trail, but grizzly bears have not been seen in the area and the berries along the trail are ripe. For hiking on the trail to be safe, it is necessary but not sufficient that berries not be ripe along the trail and for grizzly bears not to have been seen in the area Draw truth table for (p rightarrow q) doubleheadarrow (-q squareroot -p) and (p q) rightarrow (p q). Are P rightarrow and -P rightarrow -Q equivalent