Multiply the conjugates.(9 + 
)(9 - 
)
A. 86
B. 86 - 18
C. 86 + 18
D. 76
Answer: D
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Provide an appropriate response.Urban encroachment is causing the area of a forest to decline at a rate of 8% per year. Use the approximate half-life formula to determine the half-life of the forest.
A. 8.75 years B. 17.50 years C. 1.08 years D. 7.50 years
Write the vector v in the form ai + bj, given its magnitude 
and the angle ? it makes with the positive x-axis.
= 7, ? = 120°
A. v = 7
B. v = 7
C. v = 7
D. v = 7
Find the least common denominator (LCD).
, 
, 
A. 72x2 B. 8x3 C. 72x3 D. 72x5
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 on a screen 5 feet from a light is 3 foot candles, find the intensity on a screen 20 ft from the light.
A. 
foot-candles
B. 
foot-candles
C. 2 foot-candles
D. 1
foot-candles