what is the most appropriate unit to measure the following; the length of a football field. b) the diameter of a tennis ball​

When balancing a chemical equation:

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.

How do you interpret a chromatogram for what mixtures contain?