Write the explicit formula for the sequence 3, 9, 15, 21..

7x+8y=-18, 4x-9y=-3 solve the system of equations

Use the x-intercept method to find all real solutions of the equation.x^3-10x^2+27x-18=0

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.