To solve this problem you must apply the proccedure shown below:
1. First, you must calculate the constant of proportionality . You have that the pitch of a musical note varies inversely as its wavelength, therefore:
2. Now, solve for :
3. If the pitch of a tone that has a wavelength of , you must substitute the values of the constant of proportionality and this value of the wavelenght into the equation shown above:
The answer is the temperature goes down 2.8° every hour and the expression is x=-11.2/4 because 4 is how many hours between 6pm and 10pm and its -11.2 because that was how much the temperature dropped from 6pm to 10pm