District rankings for the debate team are distributed after every match. if there are 6 teams and only 3 can place, how many ways can the rankings appear?

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

Over the course of the school year, you keep track of how much snow falls on a given day and whether it was a snow day. your data indicates that of twenty-one days with less than three inches of snow, five were snow days, while of the eight days with more than three inches of snow, six were snow days. if all you know about a day is that it is snowing, what is the probability that it will be a snow day?

Tim has obtained a 3/27 balloon mortgage. after the initial period, he decided to refinance the balloon payment with a new 30-year mortgage. how many years will he be paying for his mortgage in total?