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y varies directly as the square of R. If y is 7 when R is 3​, find y when R is 15 . ​a) Write the variation. ​b) Find y when R is 15.

User Gio Borje
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1 Answer

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Explanation:

a.


y = k {r}^(2)


7 = k {3}^(2)


7 = 9k


k \: = (7)/(9)


y \: = (7)/(9) {r}^(2)

b.


y \: = (7)/(9) * {15}^(2)


y = (7)/(9) * 225

y = 175

User HttPants
by
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