When two musical notes are a “fourth” apart, the frequency of the lower note is 3/4 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.

The answers 5 so there’s the you need trust me it’s right

Look, when you want to do something like put it like x^2. x2 could mean x² or x₂. so to clear confusion, know the notation. to find the product multiply the x's and you get -8x and the y's and you get 6y. since it's all being multiplied it is just -8x6y, or answer a. although the better answer is -48xy(combining -8 and 6) because you should multiply constants whenever you can.