Solve the problem.A circular hole is filled with concrete to make a footing for a load-bearing pier. The hole measures 18 inches across and requires 1.5 bags of concrete in order to fill it to ground level. What is the depth of the hole? Round your answer to the nearest inch. (One bag of concrete, when mixed with the appropriate amount of water, makes 1800 in.3 of material.)
A. 8 in.
B. 11 in.
C. 17 in.
D. 15 in.
Answer: B
Mathematics
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B. 
C. 
D. 
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A. 
B. 
C. 
D. 
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Solve the problem.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 5 ft from a light is 3 
find the intensity on a screen 15 ft from the light.
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