what is the value of X? (explain your answer) A- 54B- 75C-78D-102

x = 102
Here, we want to get the value of x in the diagram
From what we have, the angle 78 and x are supplementary meaning they add up to 180 since they form a straight line angle
Thus;
78 + x = 180
x = 180-78
x = 102