The probability is 0.6 that an "unfair" coin will turn up tails on any given toss. if the coin is tossed 3 times, what is the probability that at least one of the tosses will turn up tails?

6. sarah saved $12.75 every week for a number of weeks, w. she received an additional $25 during the last week in which she saved money. write and solve an equation to find the number of weeks, w, for which sarah had saved money if she has $114.25 now.