Write a linear expression in simplest form to represent the perimeter of the triangle at the right then find the perimeter of the value x is 10 millimeters

Asurvey of 45 teens found that they spent an average of 25.6 hours per week in front of a screen (television, computer, tablet, phone, based on the survey’s sample mean, which value could be the population mean? 2.3 hours 27.4 hours 75.3 hours 41.5 hours