Convert the following Fahrenheit temperatures to the Celsius and Kelvin scales.
a. $-459^{\circ} \mathrm{F}$, an extremely low temperature
b. $-40 .{ }^{\circ} \mathrm{F}$, the answer to a trivia question
c. $68^{\circ} \mathrm{F}$, room temperature
d. $7 \times 10^{7}{ }^{\circ} \mathrm{F}$, temperature required to initiate fusion reactions in the sun