I need with this 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

Find the commission on a $590.00 sale if the commission is 15%.

If you prove that ∆wxz is congruent to ∆yzx, which general statement best describes what you have proved?