A wave travels down a string with a velocity of 512 m/s. If the string has a length of 6.84 meters, what is the second harmonic frequency of this string? 1. 165 Hz
2. 37.1 Hz
3. 3500 Hz
4. 74.9 Hz

Delbert keeps track of total of the total number of points he earns on homework assignments, each of which is worth 60 points. at the end of the semester he has 810 points. write an equation for delbert’s average homework score a in terms of the number of assignments n.