Judges rule on whether something is constitutional or unconstitutional. What does this mean?

On a supply and demand graph, equilibrium is the point where the two curves meet. the supply curve begins. the supply curve ends. the demand curve ends.

Acurb of this color means you may not stop a) yellow b)green c) red d) blue

Which act was a response to three high-profile assassinations? a. the mailing of firearms act b. the national firearms act c. the gun control act d. the brady handgun violence prevention act