Solve.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 
find the intensity on a screen 20 ft from the light.
A. 0.13 foot-candle
B. 2 foot-candles
C. 0.11 foot-candle
D. 8 foot-candles
Answer: A
You might also like to view...
Solve the problem.If a rock falls from a height of 70 meters on Earth, the height H (in meters) after x seconds is approximately 
What is the height of the rock when x = 1.6 seconds? Round to the nearest hundredth, if necessary.
A. 57.71 m B. 57.46 m C. 82.54 m D. 62.16 m
Solve the problem.The revenue from the sale of a product is given by R = 1620x - 12x2 - x3. If the sale of 10 units gives a total revenue of $14,000, find another number of units that will give $14,000 in revenue.
A. 50 units B. 33 units C. 18 units D. 28 units
Find the volume. Use ? ? 3.14. Round to the nearest tenth when necessary.a cube with side 8 in.
A. 512 in.3 B. 24 in.3 C. 64 in.3 D. 128 in.3
Determine whether the graphed relation is a function.
A. function B. not a function