The formula shows the brightness of the light of an object, which varies inversely as the square

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The formula shows the brightness of the light of an object, which varies inversely as the square of the distance. L, measured in lumens, is the brightness of the light and d, measured in meters, is the distance from the object to the light source.

At distance 2 meters from a light source, the brightness of an object was measured at 9 lumens. What is the value of k?

A) 18
B) 24
C) 32
D) 36

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The formula shows the brightness of the light of an object, which varies inversely as the square

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P d² k = 7

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Acing The New SAT Math

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