In how many different ways can 6 runners be assigned to 6 lanes at the start of a race?

Consider the set of all four-digit positive integers less than 2000 whose digits have a sum of 24. what is the median of this set of integers?

Use the elimination method to solve the systems of equations.choose the correct ordered pair. 7x+4y=39

Marcus and cody both leave the park at the same time, but in opposite directions. if cody travels 6 mph faster than marcus and after 4 hours they are 64 miles apart, how fast is each traveling? solve using rare times time = distance.