Solve for x: b/2 - 5 = 2

What properties allow transformation to be used as a problem solving tool

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

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)