In the accompanying figure, the item identified as number 7 refers to the ____.
A. T.V.
B. BOT. V.
C. AUX. V.
D. L.V.
Answer: D
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By the end of the 1700s, what was the percentage of people living in rural areas of colonial America?
A. 25 percent B. 40 percent C. 60 percent D. 75 percent E. 90 percent
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Ductility refers to the ability of a pipe to _____.
a. bend under loads without breaking b. resist corrosion c. resist water hammer d. resist high temperatures
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In terms of municipal water treatment plants, what is influent? Effluent? How can these two terms be confusing?
What will be an ideal response?
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Let X and Y be random variables with 
=1, 
=2, 
=3, 
=1, and 
=0.5. Find the means and variances of the following quantities.
a. X+Y b. X–Y c. 3X+2Y d. 5Y – 2X
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