Mathematics, 07.10.2019 00:30 iiWavyArthur
If y = 7.2 when x = 10, what is the value of x when y = 20? (y varies inversely as the square of x.)
a. 6
b. 10
c. 14.4
d. 20
Answers: 3
![y\propto \dfrac{1}{x^2}\\\\\\\Rightarrow y=k\times \dfrac{1}{x^2}~~~~~~~~~~~~~~~~\textup{[where k is the proportionality constant]}](/tpl/images/0295/5235/5861a.png)
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If y = 7.2 when x = 10, what is the value of x when y = 20? (y varies inversely as the square of x....
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