Why did some private american companies decide to build roads? a private companies received federal money to build the roads. b private companies did not build roads. c privatecompanies wanted to provide free roads that would enable more settlers to move west. d private american companies knew they could make a profit by charging travelers for using the roads?

Ascientist performs an experiment where she measures the mass of a piece of metal, pours acid onto the metal, washes the metal, and then re-measures the mass of the metal. the scientist repeats the experiment several times, each time increasing the amount of acid used. the dependent variable in the experiment is the: initial mass of the metal final mass of the metal amount of acid used washing the metal