Answer the question plz

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.

Find the nonpermissible replacement for binthis expression.b2/5b +5

Solve each quadratic equation by factoring and using the zero product property. 10x + 6 = -2x^2 -2