The image is the set of all points in $\mathbb{R}^4$ that you get by multiplying this matrix to points in $\mathbb{R}^5$, you can find these by checking the matrix on the standard basis. The kernel is the set of all points in $\mathbb{R}^5$ such that, multiplying this matrix with them gives the zero vector.
These seven companies alone have produced almost one-fifth (18.7 percent) of all industrial carbon released into the atmosphere since the dawn of the Industrial Revolution.
The largest rebar steel mills in developed countries and regions are all electric furnace steel mills, and most of the rebar is also produced by the electric furnace steel countries. Nucor is the world's largest electric furnace steel mill, is also the largest US rebar production enterprises. There are about 200 factories, including wholly owned subsidiary Harris Steel, David J. Joseph and Skyline Steel, with an annual capacity of more than 20 million tonnes.