What specific things changed in america when colombus arrived?

In which type of economy are these decisions made by the producers , consumers, and the goverment?

Using the president's schedule, identify one example of the president using constitutional powers and fulfilling his duties. then, explain how and why that power is limited. give your answer in the form of at least three complete sentences.

Astudent answers 86 problems on a test correctly and receives a grade of 98% how many problems were worth the same number of points