Who needs a hug from the coolest kid in the world

Look at this expression. a3b3c a-3b-3c-1 which of the following is the simplest form of the expression above?

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.

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5