Answer:
A: x= 8, angle a is 59 degrees
Explanation:
These problems are vert similar in style, so I am just going to focus on one to make this short. First of all, we know that all triangles degrees add up to 180 degrees. So we can model our equation as 67 + 6x + 6 + 7x + 3 =180. We then combine like terms, and get 13x + 76 = 180. Then subtract 76 from both sides, leaving 13x = 104, divide the 13, and you get x= 8. Then simply plug X into the equation for angle A. so 7(8) + 3, and you get angle A is 59 degrees. Hope this helps!