Pervious concrete is placed over a gravel sub base of ____ inches or more that provides a storage reservoir for rainwater, allowing it to percolate into the ground.

A. 3
B. 6
C. 9
D. 12


Answer: D

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What will be an ideal response?

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Express 440 K as a Fahrenheit scale temperature and round to the nearer tenth if necessary.

Fill in the blank(s) with the appropriate word(s).

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