GRE Exam Numerical Ability Algebra

What is the minimum value of the expression x + 4z as a function defined onR^3 , subject to the constraint x^2 + y^2 + z^2 =< 2 ?
(A) 0
(B) 2
(C) – Sqrt(34)
(D) – Sqrt(35)
(E) -5 Sqrt(2)

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GRE Other Question

If A is a subset of the real line R and A contains each rational number, which of the following must be true?
(A) If A is open, then A = R.
(B) If A is closed, then A = R.
(C) If A is uncountable, then A = R .
(D) If A is uncountable, then A is open.
(E) If A is countable, then A is closed. For how many positive integers k does the ordinary decimal representation of the integer k! end in exactly 99 zeros?
(A) None
(B) One
(C) Four
(D) Five
(E) Twenty-four