Find the length of the missing side 32ft 60ft

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.

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

If the discriminant if a quadratic equation is 4 which statement describes the roots?