Combustion reactions take place between a fuel and oxygen and produce carbon dioxide and water. Balance the following combustion reaction. C2H6O + O2 → CO2 + H2O

Which of the following is an example of how telecommunication devices people do their jobs? a.) a security guard checks the time using a digital watch. b.) a banker does some quick math using a solar calculator. c.) a nurse uses a digital thermometer to take a patient’s temperature. d.) a construction worker reports in to his office using a cell phone.