An object is placed at 0 on a number line. it moves 3 units to the right, then 4units to the left, and then 6 units to the right the displacement of the object is?

The correct answer is: +5

Explanation:

An object is placed at 0; it means:

Initial position of the object = 0.

Now it moves to 3 units to right, so keeping the standard cartesian coordinate system in mind (in right right x-axis is positive and left x-axis is right), the new position of the object will be +3.

Object now moves 4 units to the left, it means +3 - 4 = -1; object is at the position -1.

Object then moves 6 units to the right, therefore,

Final position of the object = -1 + 6 = +5.

Displacement = Final position - Initial position

Displacement = +5 - 0 = The correct answer is: +5

b. atoms in metallic solids are not arranged in a regular pattern

explanation:

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)