If 2x + 2(4 + 3x) < 2 + 3x > 2x + $\frac{x}{2}$; then x can take which of the following values?
1). -3
2). 1
3). 0
4). -1
1. What is the difference of the factors of the expression $x^{2}+ \left(\frac{1}{x^{2}}\right) - 6$
3. If 2x + 3y - 5z = 18, 3x + 2y + z = 29 and x + y + 3z = 17, then what is the value of xy + yz + zx?
6. If (x - 2)2 + (y + 3)2 + (z - 15)2 = 0, then what is the value of x + y + z - 5?
7. A number is increased by 84, it becomes 107% of itself. What is the number?
8. The 3rd and 8th term of an arithmetic progression are -14 and 1 respectively. What is the 11th term?