Answer:
You can see a red square in the middle that means its a 90 degree angle so
6x+4+4x+6=90
10x+10=90
10x=80
x=8
so the answer is B
Hope This Helps!!!
8
Step-by-step explanation:
i believe this is correct, but it is really important that you know how to do this because it is somewhat heavily used in middle school
