The net energy of 1 ton of coal is 2.8 x 10^6 BTU. The cost of extracting the coal, transporting it, and burning it is 4.2 x 10^6 BTU. What was the gross energy of the coal?

First described the system of fingerprint ridges and spirals, which eventually were used for fingerprinting. a.) fare and fidelis’s pathology b.) dr. calvin goddard c.) hans gross d.) marcelo malpighi e.) leeuvenhoek’s microscope