Kelvins = 5/9(F-32) + 273.15
K = 5/9(780-32) + 273.15
K = 5/9(748) + 273.15
K = 415.55 + 273.145 = 688.71
688.56 degrees Kelvin.
I think you tried to write 780 degrees Fahrenheit. Degrees are a measure of temperature. Kilometers indicate distance. You can't convert between the two because they are not the same types of measurements.
149 degrees F
39.2˚F
15
(-60) degrees Celsius = (-76) degrees Fahrenheit.
70 F = 21,1 C
that isn't a real question.
Start by subtracting 32 from 780. Then multiply the answer with 5 and then divide by 9. In this case the answer will be in celsius. Then add 273 to the number. In this case the answer is 688.5 K.
780ºF = ~688.71K
108°f=136.8°c
19°f=-7.22°c