. When two musical notes are a “fourth” apart, the frequency of the lower note is the frequency of the higher note. Using f as the frequency of the higher note, write an expression for the frequency of the lower note

I literally don't know, but I hope somebody helpful comes along and actually answers this for you. Much love dude. :)

Step-by-step explanation:

walter needs to make at least 5 more cookies but no more than 40. 5 ≥ x ≥ 40;

step-by-step explanation:

walter has to make a minimum of 20 cookies. he already has 15 cookies made, so he must make 5 more to meet the minimum.

the maximum amount of cookies he can make is 55. he already has 15, so he has to make no more than 40 more cookies to meet the maximum.