Hi! can someone simplify this, thank youu

Idon’t understand this.. will someone ? will mark brainliest along with 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.

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?