If 8x+6=4x+38
8x-4x=38-6
4x=32
x=32/4=8
Angle of A is equal to angle of B (mirrored)
Then angle of B is 4x+38 = 4*8+38 = 32+38=70
Answer:

Step-by-step explanation:
Cosine (cos) is adjacent by hypotenuse. 
In any of the 45° angles, 1 is adjacent and √2 is the hypotenuse.
So arrange them to get 
2
The coefficient always comes before any unknowns, so for 2xy3, 2 is the coefficient.
Answer:
B because the input is not the same!
Step-by-step explanation:
Not A because the input can't be the same.
Not C because the input can't be the same.
Not D because the input can't be the same.