Someone help me with this please, it’s overdue :(

Which of two curves exhibits exponential growth

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 many moles are in 1.26*10^24 particles in significant figures