pls help i need both blanks the options for the second one is left, right, up, down PLS HURRY ITS TIMED!!

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.

Evaluate the expression for the given value of the variable 7a - 4a for a =8

You receive 15% of the profit from a car wash how much money do you receive from a profit of 300