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@jim_thompson5910 Urgent help!

y varies directly as the cube of x
means
y = kx^3

when x=0.5, y =2.5
y = kx^3
2.5 = k*(0.5)^3
Solve for k

Thanks a lot

@jim_thompson5910 k=2.5/0.025 < how to solve this without a calculator :D

@jim_thompson5910 I got 100,what next ?

@jim_thompson5910 ??

you should have gotten k = 20

I mean i got 20 what next

y = kx^3
y = 20x^3
540 = 20x^3
Solve for x