On the architect’s plans for a new high school, a wall represented by MN has endpoints M (-3, -1) and N (2, 1). A wall represented by PQ has endpoints P(4, -4) and Q(-2, 11). Are the walls perpendicular? Explain.

Caleb and emily are standing 100 yards from each other. caleb looks up at a 45° angle to see a hot air balloon. emily looks up at a 60° angle to see the same hot air balloon. approximately how far is the hot air balloon off the ground? a)44.2 yd. b)63.4 yd. c)73.2 yd. d)89.7 yd.