There are 100 runners entered in a marathon. how many different groups of three runners can finish in first, second, and third?
does this problem involve permutations or combinations?

What is the perimeter of trapezoid jklm? + units 2 + + units 9 + units 9 + + units

How do you solve a question like this?

Do more republicans (group a) than democrats (group b) favor a bill to make it easier for someone to own a firearm? two hundred republicans and two hundred democrats were asked if they favored a bill that made it easier for someone to own a firearm. how would we write the alternative hypothesis?