What is the distance between (2,1) and (3,7)

Me what is the value of x? showing work would be appreciated - ! : )

The triangles are similar. what is the value of x? show your work.

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