Convert 7 3/4 to improper fraction

Can someone pls ! pls answer all. no explanation needed..

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

How many ordered pairs of positive integers satisfy xy=32?