Iron nail. the rest of those are not iron or some form of magnetic material.
Answer:
40 meters. look for the dot above the 20 on the x-axis and follow it over to the left.
Explanation:
The correct answer is letter C. Volume is decreasing. For a fixed amount of an ideal gas kept at a fixed temperature, pressure and volume<span> are </span>inversely proportional<span>. </span>
