PLz help WILL MARK BRAIN

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.

Solve each quadratic equation by factoring and using the zero product property. 14x - 49 = x^2

Select all of the following expressions that are equal to 2.5.