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  • A varies jointly as $x^2$ and as $\sqrt[3]{y}$.When $x=2, y=8, A=40$. Find the percentage change in the value of A when $x=3$ and $y=729$.Option: 1

A varies jointly as $x^2$ and as $\sqrt[3]{y}$.When $x=2, y=8, A=40$. Find the percentage change in the value of A when $x=3$ and $y=729$.

Option: 1

25% increase


Option: 2

 25% decrease


Option: 3

50% increase


Option: 4

50% decrease

 


Answers (1)

best_answer

A = kx2
40 = 4k =>k=10
40 = 2k  =>k = 20
A= 90                x=3
A180                 y= 729
(90/180)*100 = 50%

 

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Sayak

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