The ceiling of a house has an area of 23.5 sq yd. What is the area in square feet?
Fill in the blank(s) with the appropriate word(s).
211.5 sq ft
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There are fewer than _____ species of reptiles north of Mexico
a. 1000 b. 1500 c. 30 d. 300
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American agriculture is based in ____________________ knowledge
Fill in the blank(s) with the appropriate word(s).
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What is DNA? Why is it important? Name the scientists who fi rst described the structure?
What will be an ideal response?
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Consider the aluminum end of the aluminum=copper phase diagram in the figure accompanying this problem. (a) Outline the complete program for obtaining a maximum hardness in an alloy of aluminum, with 4 percent copper, if the aging temperature is 403 K. (b) When the maximum hardness is obtained, what would be the nature of the precipitate? Explain.
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