Which shows the rational expression written using the least common denominator?

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

Can someone me with my math problems i have a bunch. i will give brainliest and lots of pleeeaaasssee

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