I need to know if A and B are correct and I need HELP WITH C

Explanation
Part A
[tex]\begin{gathered} x+53+68=180\text{ ---- (sum of angles in a triangles)} \\ x=180-121 \\ x=59 \end{gathered}[/tex]Answer A: 59 degress
Part B
[tex]\begin{gathered} x+46+71=180\text{ ---- (sum of angles in a triangles)} \\ x=180-117 \\ x=63 \end{gathered}[/tex]Answer: 63 degrees
Part C
[tex]\begin{gathered} x+x+24=180\text{ ---- (sum of angles in a triangles)} \\ 2x=180-24 \\ 2x=156 \\ x=\frac{156}{2} \\ x=78 \end{gathered}[/tex]Answer: 78 degrees