Choose the expression that is equivalent to a2  - b2  + 20b - 100a] (a-b-10)(a-b-10)b] (a-b-10)(a+b-10)c] (a-b+10)(a-b-10)d] (a-b+10)(a+b-10)

The vector matrix [2/7] is dilated by a favor of 1.5 and then reflected across the x axis. if the resulting matrix is [a/b] then a= and b=

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.

Asap! i'm not good math and i'm lost.