Serious answers only I’m giving 20 points away to whoever can help me with real explanation and I will mark you Brainiest

Answer:
1.3
Step-by-step explanation:
BC is the distance between B and C.
BC = x − (-0.4)
BC = x + 0.4
AB is the distance between A and B.
AB = -0.4 − (-1.25)
AB = -0.4 + 1.25
AB = 0.85
Substitute into the equation.
BC = 2AB
x + 0.4 = 2(0.85)
x + 0.4 = 1.7
x = 1.3
Answer:
x=1.3
Step-by-step explanation:
AB=(-0.4-(-1.25))=1.25-0.40=0.85
BC=2AB=2×0.85=1.70
x=-0.4+1.7=1.3