Please help me out ~ 20 points

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.

Nine more than four times a number is the same as one less than twice the number. find the number?

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)