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aleksklad [387]
2 years ago
5

The intensity of light produced by a light source varies

Mathematics
1 answer:
Harrizon [31]2 years ago
3 0

Answer:

45 foot-candles.

Explanation:

I ∝ 1d2⇒I=kd2

where k is a proportionality constant.

We can solve this problem in two ways, either solving for k and subbing back in or by using ratios to eliminate k. In many common inverse square dependences k can be quite a lot of constants and ratios often save on calculation time. We will use both here though.

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Marked down 15% means the new price would be 85% of the original price ( 100%-15% - 85%)

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