Question

please check my answer i think its c

Answer 1

Treated like your solving a linear equation, except that you will always have a positive answer because X is Absolute.

Answer 2

so just 5.33 D

Answer 3

yes.

Answer 4

hmmm well.... "x" will yield a positive value once the bars are off
BUT
"x" itself CAN be negative, since "x" is inside the bars and no subject to the positivization once the bars are off