Relation between Celsius, kelvin and Fahrenheit
[tex]K=C+273[/tex] (1)
[tex]F = \frac{9}{5}(C)+32[/tex] (2)
According to the question, helium boils at 4 K therefore convert it to in Celsius we use equation (1).
[tex]4=C+273[/tex]
[tex]C=273-4[/tex]
[tex]C=-269[/tex]C = -269
To convert in Fahrenheit we use equation (2),
[tex]F = \frac{9}{5} (-269)+32[/tex]
[tex]F= -452.2[/tex]F = -452.2