Can someone please explain how to solve for the area?

Which expression shows the sum of the polynomials with like terms grouped together

Write the expression in complete factored form. 5n_(c - 3) - n(c - 3) =

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