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6道SAT数学选择题练习

2013-10-10 15:26:37来源:互联网

  参考答案及解析:

  Explanation

  You are given that. Dividing both sides of the equation bygives. Thus, the answer is.

  2.The correct answer is C

  Explanation

  The histogram does not give the recorded heights for each cherry tree, but rather the intervals in which the heights lie. Thus, to find possible values for the average (arithmetic mean) height, one can find lower and upper bounds for the average height by calculating the averages of lower and upper interval bounds of the histogram with the frequencies given. A lower bound for the average, found by using the value at the left endpoint of the interval, is feet, and so feet would be an upper bound for the average height. Therefore, the average height of the 31 black cherry trees can be between 72.74 feet and 77.74 feet. Of the choices given, only 74 feet can be a possible value for the average height of the 31 black cherry trees.

  3.The correct answer is A

  Explanation

  An equilateral triangle has three equal sides, so the lengths of the three arcs must be equal, and thus each arc isof the circumference of the circle. The circumference of the circle is, so the length of arcisof, or.

  4.The correct answer is C

  Explanation

  Choice (C) is correct. Since, it follows that. Therefore,, from which it follows that.

  5.The correct answer is E

  Explanation

  First letequal the first value from Column, that is,. Then addto each of the three values ofin Columnas follows:,, and. Repeat this process for, for which the possible values ofare,, andand repeat it again for, for which the possible values ofare,, and. If you compare these nine values, you see that,,,, andare the onlydifferent possible values of the sumstherefore, there are five different values possible for.

  6.The correct answer is B

  Explanation

  The expressionis equivalent to, and. Since, it follows that.

  以上就是关于6道SAT考试数学选择题练习题及其答案和解析,非常详细。同学们在备考阶段,一定要加强习题的练习以及题意的理解,争取SAT数学满分。

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