A ^ 2 + 2a - b ^ 2 + 2b
plz help me fst with correct one​

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.

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

Kevin's bank offered him a 4.5% interest rate for his mortgage. if he purchases 3 points, what will be his new rate?