How do you find an a percent of an item

The table shows a pattern of exponents. what is the pattern as the exponents decrease?

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

Which expression is the factorization of x^2+10+21