又來2題math pp

kitten2815

Over a certain time period, did the number of shares of stock in Ruth’s portfolio increase?

(1)   over the time period, the ratio of the number of shares of stock to the total number of shares of stocks and bonds in Ruth’s portfolio increased.

(2)   Over the time period, the total number of shares of stocks and bonds in Ruth’s portfolio increased

答
                    E

 

 

Is X^4 + Y^4 > Z^4?

(1)   X^2 + Y^2 > Z^2

(2)   X + Y > Z

答
                E

 

kitten2815

懇請各位大大幫忙....實在是不懂這兩題如何解

hsummer

第一题,股票和债券的数量变动问题,还有题干没有说还有没有其他投资可能.