Mathematics, 06.09.2019 23:30 merzedes

I’m completed am lost with these now.
y varies with the cube of x. if y=81 when x=1/3
find y when x=1/4
i need to break it down down. i’ve redone this type of question multiple times an something is not right. i did ^3 cubes and checked it all. even converted 1/3 to decimals and it still getting it wrong.

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I’m completed am lost with these now.
y varies with the cube of x. if y=81 when x=1/3
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