Three vehicles approach a 4-way stop; they all get there at the same time. Car A is on the right of Car B. Car C is to the left of Car B. In which order should they pass through the intersection

Aflute player hears four beats per second when she compares her note to a 523 hz tuning fork (the note c). she can match the frequency of the tuning fork by pulling out the “tuning join” to lengthen her flute slightly. what was her initial frequency?