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 foot-candles, find the intensity on a screen 20 ft from the light.
A. 
foot-candle
B. 2 foot-candles
C. 
foot-candle
D. 1
foot-candles
Answer: A
Mathematics
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Translate the phrase to an algebraic expression.five hundred three less than x
A. 503x B. x + 503 C. x - 503 D. 503
Mathematics
Write the equation of the line with the given slope and y-intercept.Slope 6; y-intercept is 9
A. y = -9x - 6 B. y = 9x + 6 C. y = 6x + 9 D. y = -6x - 9
Mathematics
Use the table to find the probability.The following table indicates the preference for different types of soft drinks by three age groups.
If a person is selected at random, find the probability that the person is over 40 and drinks cola.
A. 
B. 
C. 
D. None of the above is correct.
Mathematics
Divide.18 ÷ 2
A. 8 r 1 B. 10 C. 8 r 2 D. 9
Mathematics