Option A. 150 m 3 is the correct one
If X and Y vary directly, as x decreases, what happens to the value of y?
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the memory is the independent, because that can vary at will, so it's independently varying at will, whilst the amount of songs are limited to how much memory there's in the CD, so the songs are dependent on the memory availability.
I'm going to put it into decimals because it is easier.
3.5*1.5=5.25 or
Hope that helps
3.5*1.5=5.25 or
Hope that helps