Geometry i need help now and could you tell me the name of the subject

Step-by-step explanation:

5, 7 and 8 are midsegments of the given triangle.

As per property, midsegment is parallel to one of the sides and is equal to its half by measure.

Midsegment with the length of 8 is parallel to side with the length of x and is half of its size:

i get you, what you should do is think of the positive things that would come out of it. it will make yours parents proud and raise your grade. you should always try and if you can't focus tell the teacher.