A)78°
135°+a° =180°
a°=45°
57°+x°+a°=180°
57°+x°+45°=180°
102°+x°=180°
x°=180°-102°
x°=78°
Answer:
Step-by-step explanation:
I think it is D but I am not sure
i think the answer should be 8
7x+3=2x-6 #4
