1) 30.35 in Hg is larger than the standard 29.92 and results in a pressure altitude lower than the runway elevation:
(29.92 - 30.35) * 1000 = -430 ft
PA = 3894 - 430 ft = 3464 ft
2) 25°F is below freezing and is a negative number in degrees Celsius:
(25 - 32) * (5/9) °C = -3.89 °C
3)...