Please help I'm awarding 15 points to the best answer!
 
											 
											42
Top triangle is 9
the bottom is 15
added together is 24
the whole box is 66
66-24=42
Step-by-step explanation:
the area of shaded part =
(11×6) - (½×5×6)-(½×3×6)
= 66-15-9 = 42 sq. units