Please help me........

1. The real numbers x satisfying √(x + 5)/(1+x) > 1 are precisely those which satisfy?
(A) x < 1
(B) 0 < x < 1
(C) -5 < x < 1
(D) -1 < x < 1

2. Let P(X) = 1 + x + x² + x³ + x⁴ + x⁵. What is the remainder when p(x¹²) is divided by P(x)?

3. Find the value of [√(√5 + 2) + √(√5 - 2)]/[√(√5 + 1)]

4. If x, y and z are real numbers such that (x - 3)² + (y - 4)² + (z - 5)² = 0. Then x + y + z =
(A) - 12
(B) 0
(C) 8
(D) 12

I am somewhere confused in question 4. Please help..........!