SOMEONE PLEASE HELP AND ANSWER MY QUESTIONS ON MY PROFILE THAT ARE UNANSWERED, I WILL MARK YOU BRAINLIST AND GIVE YOU 5 STARS, PLEASE!!

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.

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

Witch represents the inverse of the function f(x)=1/4x-12