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 
find the intensity on a screen 15 ft from the light.
A. 
foot-candle
B. 3 foot-candles
C. 
foot-candle
D. 2 foot-candles
Answer: C
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Solve the problem.If a is proportional to b, and a = 45 when b = 5, find a when b is 8.
A. 73 B. 72 C. 90 D. 71
Solve the problem.A circular sector has an area of 486 ft2. The radius of the circle is 9 feet. What is the arc length of the sector?
A. 110 ft B. 54 ft C. 12 ft D. 108 ft
Solve the problem.Jerry has three pieces of string. The total length is 95 inches. The sum of the two longer pieces is 79. The middle piece is twice as long as the shortest piece. What are the lengths of the three pieces?
A. 8, 16, and 71 inches B. 47, 57, and 71 inches C. 16, 47, and 57 inches D. 16, 32, and 47 inches
Use a graphing calculator to solve the equation. Round your answer to two decimal places.ex - ln x = 3
A. {1.14} B. {0.57} C. {1.27} D. {2.17}