Select all the equations on which the point 5,3 lies

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

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

What is the total area of the figure?