[求助]求教两道数学题

今天第一次做数学，结果让人崩溃！总算明白了为什么说数学题中充满陷阱，除去中招的题目，还有2道题不明白，特向大家求助，谢谢！

In the decimal representation of x, where 0 < x < 1, is the tenths digit if x nonzero?
(1)   16x is an integer.
(2)   8x is an integer.
  
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is
sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

Answer:B             没有读懂题干，请问本题具体是什么意思？

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If y is the smallest positive integer such that 3,150 multiplied by y is the square of an

integer, then y must be

A.  2

B.  5

C.  6

D.  7

E.  14

Answer:  E     还是没读懂题干，请问本题中文翻译？

第一题，我觉得应该是is the tenths digit of x nonzero if x nonzero?

就是问如果x非零，x的十分位非零吗？

(1)代入1和2，可以非零可以不非零，不充分

（2）代入1，非零，则一定非零。充分

选B

第二题，3150写成5^2*3^2*2*7，所以y=2*7=14