PLS HELP THE QUESTIONS IN THE PHOTO THX!!!

Answer:
x=12 and 9b is right triangle I think
Step-by-step explanation:
u just subtract 78 from 90 and u get 12
Answer:
X=12
Step-by-step explanation:
You add up the numbers 78 and 90(bc the little box means 90) and get 168 you subtract that from 180 which is like the whole of the triangle and get 12 for x
I’m not sure about everything but I think it is a right triangle because it has the little box in the corner which is a symbol for 90 degrees which means a right triangle