Well, an interior angle plus an exterior angle has to equal 180°. Also, the sum of the interior angles is represented by this formula: [-2 + n]180, whereas the sum of the exterior angles all add up to 360°, and is represented by this formula: 360/n [let "n" represent the number of sides in every polygon].
Is there any way you could provide more information, a picture or something could be really helpful.
Answer:

Step-by-step explanation:
Given matrix is,

Operations performed,
-10R₂ → R₂

3R₃ → R₃

Answer:
x = 15°
Step-by-step explanation:
First Identify the angle of x by subtracting 180° - 120° = 60°
Always remember when you see a straight line the line measures 180°
So the angle of x = 60° but not the value of x so use the given equation to find the value of x
3x + 15 = 60°
3x - 15 = -15°
3x = 45
x = 15°
Answer:
34.5 hours as carpenter or 27.6 hours for blacksmith (Not sure about this sorry)
Step-by-step explanation:
690 ÷ 20 and 690 ÷ 25