Math i don't know this and i looked at everything

Which expression is equivalent to 2^4y^3

15 points ! ~ see if you know the answer to both you!

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