Carbon dioxide forms into a solid (dry ice) at approximately -157°F. What temperature in degrees Celsius does this correspond to?

Answer 1

F = 9C/5 + 32 = -157,

9C/5 = -157 -32,
9C/5 = -189,
Multiply both sides by 5:
9C = -945,
C = -945 / 9 = -105 Deg. Celcius.