How do you calculate the midpoint of question e)? I am very desperate. please help

Of the ones listed here, the factor that had the greatest impact on the eventual destruction of native americans' ways of life was the development of the a) automobile. b) highway. c) railroad. d) steamboat.

Answer for 10 points show work you guys in advanced < 3

Acarton of juice contains 64 ounces miss wilson bought six cartons of juice how many ounces of juice did she buy