Solve the problem.The intensity of a radio signal from the radio station varies inversely as the square of the distance from the station. Suppose the the intensity is 8000 units at a distance of 2 miles. What will the intensity be at a distance of 13 miles? Round your answer to the nearest unit.
A. 172 units
B. 215 units
C. 153 units
D. 189 units
Answer: D
Mathematics
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Use order of operations to simplify the expression.-6 - 
A. 10 B. -10 C. -6 D. 6
Mathematics
Solve the quadratic inequality if possible. Round your answer to the nearest tenth, if necessary.10x2 ? 9x2 - 9
A. All real numbers satisfy this inequality. B. No real number satisfies this inequality. C. -3 ? x ? 3 D. x ? 3
Mathematics
Evaluate the following:
1. 
2. 
3. 
Mathematics
Solve the problem.The population p, in thousands, of one town can be approximated by 
where d is the number of years since 1985. Estimate the population of the town in the year 1990.
A. About 7 B. About 11,000 C. About 7000 D. About 15,000
Mathematics