Add 11 + 16. Plug in 11 into b-2 since b equals eleven. You should now have 11+16+11-2. Do the same thing and plug in 16 for c and 11 for b for c-b. Your solution will now be 11+16+11-2+16-11.
The angle for a straight line is 180 degrees. So, to find x, you must subtract the angle given from the angle from the straight line to get 180-151=29 degrees.
