Write an equation that expresses the relationship. Use k as the constant of variation.The intensity I of light varies inversely as the square of the distance D from the source. If the intensity of illumination on a screen 72 ft from a light is 3.2 foot-candles, find the intensity on a screen 90 ft from the light.
A. 2.56 foot-candles
B. 4 foot-candles
C. 2.048 foot-candles
D. 5 foot-candles
Answer: C
Mathematics
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f(x) = 0, 
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What will be an ideal response?
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Find the exact value of the product.cos 45° cos 15°
A. 
B. 
C. 
D. 
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Solve the problem.What is the ratio of the surface areas for a pair of similar hemisphere when the ratio of the radii is 3 : 4?
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Mathematics