On a coordinate plane, triangle Q R S has points (negative 9, 5), (6, 10), and (2, negative 10).
Find the area of the triangle QRS.

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.