Please solve if so thank you

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.

What is the difference between the predicted value and the actual value

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles