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 5 feet from a light is 2 foot-candles, what is the intensity 15 ft from the light?
A. 1
foot-candles
B. 2 foot-candles
C. 
foot-candles
D. 
foot-candles
Answer: D
Mathematics
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Write a system of linear inequalities that has the given graph.
A. x ? 0 y ? 0 y ? 8 x + y ? 3 B. x ? 8 y ? 8 x + y ? 3 C. x ? 0 y ? 0 x ? 8 x + y ? 3 D. x ? 0 y ? 0 x ? 8 y ? 8 x + y ? 3
Mathematics
Evaluate the expression.
A. 
B. 
C. 
D. 
Mathematics
Factor.n3 - 
A. 
B. 
C. 
D. 
Mathematics
The following table shows the approximate number of males of Hispanic origin employed in the U.S. in 2005, broken down by age group. In what age interval does the empirical rule predict that 68 percent of all male Hispanic workers will fall? Please round answers to the nearest year. Age15 - 24.925 - 54.955 - 64.9Employment (thousands)16,00013,0001,600??
A. 31 - 42 B. 19 - 31 C. 19 - 42 D. 12 - 31 E. 12 - 42
Mathematics