Okay so I'm trying to find the volume of a sphere with the radius of 3/4k. When I cube 3/4 do I only cube the top number?


No, you cube all of the numerator and denominator. This is because when you cube anything you do the number multiplied by the number 3 times. So you do the same with fractions.
 \frac{3}{4} * \frac{3}{4} * \frac{3}{4}  =  \frac{3}{4} ^{3}


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