又來2題math pp

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

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

(1)   X^2 + Y^2 > Z^2

(2)   X + Y > Z

答
                E

懇請各位大大幫忙....實在是不懂這兩題如何解