Solve the variation 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 feet from a light is 2 foot candles, find the intensity on a screen 15 ft from the light.
A. 
foot-candles
B. 
foot-candles
C. 2 foot-candles
D. 1
foot-candles
Answer: A
Mathematics
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Find the equation of the circle with a radius of 6 and its center at the intersection of 
and 
.
?
A. ?
B. ?
C. ?
D. 
E. none of these
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Express the number 250,000 in scientific notation.
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Mathematics
Solve the problem.Mary and her brother John collect foreign coins. Mary has three times the number of coins that John has. Together they have 120 foreign coins. Find how many coins Mary has.
A. 18 coins B. 84 coins C. 30 coins D. 90 coins
Mathematics