36.(6)°C
373.15°K
285.37(2)°K
Hi there !
°Celsius = 5/9×(°F - 32)
°C = 5/9×(98 - 32)
= 5/9×66
= 330/9
= 36.(6)°C
°Kelvin = (°C) + 273.15
°K = 100 + 273.15
= 373.15°K
°Kelvin = 5/9×(°F + 459.67)
°K = 5/9×(54 + 459.67)
= 5/9×513.67
= 2568.35/9
= 285.37(2)°K
Good luck !