What kind of economy did the colonies/early america have​

What did the incas accomplish? a. written language b. formalized religion c. conquest of the western south america d. formalized government

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

Which piece of information would most a historian create an interpretation of this photograph of works in a factory?