Plz help me I will give you a brainest

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

If f(x)=x+7 and g(x)=1/x what is (fog)(x)

Why is x= 4 a solution to the proportion 14/x 56/1 6