Help me please!! The density of pure iron is 7.874 g/cm3 . A piece of steel made of pure iron and other types of iron is in the shape of a rectangular pyramid. The rectangular pyramid has a base edge length of 4 cm , a base edge width of 9 cm , a height of 5 cm , and a mass of 425 g . What is the difference between the density of pure iron and the density of the steel rectangular pyramid? Round your answer to the nearest thousandth.