Answer:
x=2
Explanation:
All angles in a triangle add up to 180 degrees, so first subtract the numbers on the other angles from that (so...180-80-65), which would be 35. You now need to subtract the 1 that is being added to your unknown number, meaning your unknown number should equal 34 (sorry if that doesn't make sense). So now you need to divide 34 by 17 which would be 2. (x=2) Or you can ask yourself, "how many times can 17 go into 37 or what times 17 is 34?" hope that helped!