Ithink i know how to solve this, but could someone check my work for me?

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.

Which letters from the table represent like terms? a and b b and c a and d b and d

Which of the following can be used to explain a statement in a geometric proof?