when two musical notes are a "fourth" apart, the frequency of the lower note is 3/4 the frequencyof the higher note. using f as the frequency of the higher note, write an expression for the frequency of the lower note.

The party planning committee has to determine the number of tables needed for an upcoming event. if a square table can fit 8 people and a round table can fit 6 people, the equation 150 = 8x + 6y represents the number of each type of table needed for 150 people.