11. In ΔPQR, if PQ = x + 2, and PR = y, which of the three angles

of ΔPRQ has the greatest
degree measure?
(1) y = x + 3
(2) x = 2
Explanation:
In any triangle, the largest angle is opposite the longest side. To

determine the longest sidesuffices to determine whether y > x + 2.

Since x + 3 > x + 2, it follows from (1) that y > x + 2.
Statement (1) alone is therefore sufficient. From (2) it follows

that PQ = 2 and QR = 4. Thus, y can
be any value between 2 and 6; it follows that y > x, but it cannot

be concluded that y > x + 2.
Statement (2) alone is therefore not sufficient. Therefore,

statement (1) ALONE is sufficient, but
statement (2) alone is not sufficient to answer the question.

百思不得其解 ，og好像少写了 OR为X 这个条件。

在考察利息问题的时候，对于我们只需要关注两个问题，一个是单复利的区分，另外一个是ETS经常会问an annual rate of 6% percent compounded quarterly（或monthly）的问题，只要小心quarter rate=1/4 annual rate, month rate=1/12 annual rate即可，或者反过来。

请问单利是什么概念　复利又是什么概念？？？　谢谢!!