What does |x| mean. i'm talking about the lines specifically.

Those lines stand for the absolute value, or how far away it is from zero.

If you draw a number line from -3 to 3, and plot the points x = 2 and x = -2, what similarities do you see?
Although one is two units to the right of 0 and one is two units to the left of 0, both x = 2 and x = -2 are two units away from zero. Therefore, the absolute value of both 2 and -2 is 2.

6The absolute value.

Ex:
l1l is 1
l-4l is 4
l9l is 9
l-434l is 434
l675l is 675
 

The answer would be the second choice : )

a - base

b - exponent

so,

the base is 8the exponent is 3the exponent tells you to multiply 8 together three timesthe expanded form is 8*8*8