老师22题不太明白为什么选c，我是用排除法做的 23为什么equity的成本需要根据投资者的要求回报率来衡量？

A B 是连续的还是离散的

The value of a 2.5year, $100 par value Treasury bond with an 8% coupon rate, using the U.S. Treasury forward rates provided following, is closest to: A $105.54 B $104.87 C $109.82 到底应该怎么想怎么做呢？10到这样题从来没对过，你们的课也没讲过这样的，例题记在笔记本上每天都看还是不会

The 5-year spot rate is 9.65%, and the 4-year spot rate is 8.98%. What is the 1-year forward rate three years from today? A 12.37%. B 13.37%. C 10.05%. 画了时间轴，还是没思路

Given the following spot and forward rates: Current 1-year spot rate is 5.4%. One-year forward rate one year from today is 7.52%. One-year forward rare two years from today is 12.56%. One-year forward rate three years from today is 13.3%. The value of a 4-year, 10% annual-pay, $1,000 par value bond is closest to: A $996. B $1022.62. C $1,086. 老师这题怎么想？这种题就没对过，公式写对了也很难算对，

老师，第19题，最后算出来的pv取180天，是因为题目中说了semiannyal，如果是annual，是不是就是360天，如果频率为quarter是不是就是90?

请问，这两个有什么区别呢？

如何判断是否出现多重共线性的问题？如有如何处理？

YTM是持有至到期的复利年华收益率吗

第二题的 c选项要如何判断呢 谢谢