Checking Needed, DONE: ONLY NEEDS CHECKING

Hey, Can someone confirm my answers please. Some questions I got two answers, can someone tell me which one is the right answer.

Question 1   
The scalar equation of the line perpendicular to (x, y) = (5, 2) +r(1, -3) through the point (2, -2) is

x-3y+8=0

Question 2   
If the point (4, -4, g) is on the line (x, y, z) = (8, 0, -2) + t(1, 1, 3), the value if g is

-14

Question 3
The cross product of vectors a = (-1, 4, 6) and b = (3, 0, 2) is

(8,20,-12)

Question 4   
The derivative of y = x ? is

x^n*lnx OR nx^(n-1)

Question 5   
The derivative of y = ?x

n^x*lnx OR n^x * ln(n) : IS IT lnx or ln n

Question 6   
If point (a, ƒ(x)) is a critical value of the function y = ƒ(x), and ƒ?(x), then the point is said to be a local=

extrema

Question 7   
The derivative of y = 5x is

5x*ln5 OR 5

Question 8   
A function y with the property that y = -y? is

-e^(-x)