Aplane flies 1.5 hours at 110 mph on a bearing of 40°, it then turns and flies 1.3 hours at the same speed on a bearing of 130°. how far is the plane from its starting point?

 Final X value = [(cos 40)*(110m/h *1.5h)] + [(cos 130)*(110m/h*1.8h)] = (126.397 - 127.271)m = -.0873 mile. 

Final Y value = [(sin 40)*(110m/h*1.5h)] + [(sin 130)*(110m/h*1.8h)] = (106.059) + 151.677)m = 257.736 Mile 

Distance from starting point = .873m] / [sin (arc tan .873/257.736)] = 257.737 miles

C. 92

Step-by-step explanation:

The sum of all the angles in a triangle should be 180. Add the measures 57 and 31 together to get 88. subtract 88 from 180 to get 92.