You have 784 grams of a radioactive kind of europium. If its half-life is 13 years, how much
will be left after 39 years?

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

Suppose you just purchased a digital music player and have put 8 tracks on it. after listening to them you decide that you like 4 of the songs. with the random feature on your player, each of the 8 songs is played once in random order. find the probability that among the first two songs played (a) you like both of them. would this be unusual? (b) you like neither of them. (c) you like exactly one of them. (d) redo () if a song can be replayed before all 8 songs are played.

Afair die is cast four times. calculate the probability of obtaining exactly two 6's round to the nearest tenth of a percent