Help ASAP I’ll mark you as brainlister please HELPP ik crying I feel so useless pleasee

What is the value of the expression below? (81^2)^1/8

What is the perimeter of a rectangular building that is 80 feet wide and 140 feet deep?

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