(i need i wanna go to sleep)the temperature dropped 1.8 *c each hour 4 1/2 hours starting from 8 p. m. if the temperature was 4.6*c at 8 p. m, what was the temperature at 12: 30 a. m?

The serenity and the mystic are sail boats. the serenity and the mystic start at the same point and travel away from each other in opposite directions. the serenity travels at 16 mph and the mystic travels at 19 mph. how far apart will they be in 3 hours?