Respuesta :
Answer: 3000 Kelvin
Step-by-step explanation
Let the surface temperature of the red giant star = x
Surface temperature of a white dwarf star = 4x
4x = 1.2 × 10^4 K
  = 1.2 × 10,000 K
  = 12,000 K
4x = 12,000 K
x = 12000 ÷ 4
 = 3,000 K
Answer:
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Step-by-step explanation: