Can someone help me wait thses question

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

Rose bought a new hat when she was on vacation. the following formula describes the percent sales tax rose paid b=t-c/c

Write as a product: ac^2–ad+c^3–cd–bc^2+bd