Mariam is a waitress at a restaurant. Each day she works, Mariam will make a guaranteed wage of $30, however the additional amount that Mariam earns from tips depends on the number of tables she waits on that day. From past experience, Mariam noticed that she will get about $9 in tips for each table she waits on. How much would Mariam expect to earn in a day on which she waits on 19 tables? How much would Mariam expect to make in a day when waiting on tt tables?

《riddle》 a man is stranded on an island covered in forest. one day, when the wind is blowing from the west, lightning strikes the west end of the island and sets fire to the forest. the fire is very violent, burning everything in its path, and without intervention the fire will burn the whole island, killing the man in the process. there are cliffs around the island so he can't jump off. how can the man survive the fire? (there are no buckets or any other means to put out the fire.)