Can someone please help me

Thomas jefferson was the president of the united states. first second third fourth

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

Wire campaign finance laws administered by the fec not well enforced? a campaign finance rules are difficult to enforce b the fec has been plagued by corruption? c the fec does not have enough staff or funding d the fec was only created by the america vote act of 2002