PLEASE HELP URGEN

A row operation is performed on a matrix as shown below.

I 2 -1 1 I 4 I. I 0 -3. x I -18 I
I 1 1 1 I 11 I > I 1. 1. 1 I 11 I
I 4. -2 2 I 5 I. I 4 -2 2 I 5 I

What is the value of x?
a. -2
b. -1
c. 0
d. 3

What is the absolute value of the complex number -4-sqrt2i

Rick is driving to his uncles house in greenville, which is 120 miles from ricks town .after covering x miles rick she's a sign stating that greensville is 20 miles away. which equation when solved will give the value of x. a: x+120 = 20 b: x x120 =20 c: x +20 equals 120 d: x x20= 120

The mean of 10 values is 19. if further 5 values areincluded the mean becomes 20. what is the meanthese five additional values? a) 10b) 15c) 11d) 22