单项选择题

If a and b are the lengths of the legs of a right triangle whose hypotenuse is 10 and whose area is 20,what is the value of （a+b）²（）

A. 100
B. 120
C. 140
D. 180
E. 200

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单项选择题

The author mentions etiological myth probably in order to（）

A. cast aspersion on Cherokee legends
B. give the academic designation for legends that explain practices or events
C. show how animals were thought by the Cherokee to be able to communicate with each other

单项选择题

Which of the following sets of numbers has the greatest standard deviation（）

A. 2, 3, 4
B. 2.5, 3, 3.5
C. 1, 1.25, 1.5
D. -2, 0, 2
E. -20, 21, 21.5

If a and b are the lengths of the legs of a right triangle whose hypotenuse is 10 and whose area is 20,what is the value of （a+b）2（）

If a and b are the lengths of the legs of a right triangle whose hypotenuse is 10 and whose area is 20,what is the value of （a+b）²（）