求教prep上的数学题

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If x^4 +y^4 = 100, then the greatest possible value of x is between
A o and 3 B 3 and 6 C 6 and 9 D 9 and 12 E 12 and 15


All of the stocks on the over-the-counter market are designated by either a 4-letter or 5-letter code that is created by using the 26 letters of the alphabet. Which of the following gives the maximum number of different stocks that can be designated with these codes?5
A 2(26^5) B 26(26^4) C 27(26^4) D 26(26^5) E 27(26^5)




key: B C