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. 2 foot-candles
B. 1
foot-candles
C. 
foot-candles
D. 
foot-candles
Answer: D
Mathematics
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A right triangle with acute angle ? is given. Evaluate the indicated trigonometric function of the acute angle ?.Find sec ?.
A. 
B. 
C. 
D. 
Mathematics
Find the sum, if it exists.-39 - 
- 
- 
- . . .
A. 8 B. - 273 C. - 312 D. Does not exist
Mathematics
Solve the problem.An earthquake was recorded which was 1,000,000 times more powerful than a reference level zero earthquake. What is the magnitude of this earthquake on the Richter scale? Intensity on the Richter scale is log10(I/I0).
A. 6 B. 13.8 C. 0.6 D. 5
Mathematics
Use interval notation to describe the interval of real numbers.
A. [4, ?) B. (-?, 4] C. (-?, 4) D. (4, -?)
Mathematics