In the figure a b equals 27 b c equals 19 and ad equals 76 find cd

Anyone know? is appreciated! will mark brainliest if correct!

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.

Reflect the point (7,0) across the y-axis