What temperature is halfway between -23 and 76

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.

Write an inequality and solve each problem. for exercises 11 and 12, interpret the solution.

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?