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 2 foot-candles, find the intensity on a screen 20 ft from the light.
A. 1
foot-candles
B. 
foot-candle
C. 
foot-candle
D. 2 foot-candles
Answer: C
You might also like to view...
Solve the problem.A data-recording thermometer recorded the soil temperature in a field every 2 hours from noon to midnight, as shown in the following table. Use the Trapezoidal Rule to estimate the average temperature for the 12-hour period. Round your answer to the nearest hundredth if necessary.
A. 66.92°F B. 66.94°F C. 80.3°F D. 77.83°F
Find the probability.If three cards are drawn without replacement from a deck, find the probability that the third card is a face card, given that the first card was a queen and the second card was a 5.
A. 
B. 
C. 
D. 
Write a numerical expression for the phrase and simplify it.The sum of -11 and -9, divided by the product of 1 and -4
A. -11 + 
; 6
B. -11 + 
; - 
C. 
; 5
D. 
; - 4
Use the graph of the equation 
shown below to identify the graph of one complete cycle of the equation 
.
?
?
A. ?
B. ?
?
C. ?
D. ?
E. ?
