Approximately how many african-americans moved into harlem in the early twentieth century? 80,000 100,000 200,000 500,000

He concluded that a heavier object dropped from the same height as a lighter object will land

How do you summarize data in a two-way frequency table?

The figure below shows rectangle abcd and the triangle eca on a coordinate plane.which of the following expressions represents the perimeter of triangle of triangle eca in units