单项选择题

In a certain store, each record costs X dollars and each tape costs Y dollars. The total cost of 3 records and 2 tapes is $39.（）

A. if Quantity A is greater;
B. if Quantity B is greater;
C. if the two quantities are equal;
D. if you cannot determine the relationship based on the given information.

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热门试题

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

多项选择题

In triangle ABC, AB=AC=2. Which of the following could be the area of triangle ABC Indicate all possible areas. （）

A. 0.5
B. 1.0
C. 1.5
D. 2.0
E. 2.5
F. 3.0