If the half-life of a substance is 2 days, what is the amount of substance left at the end of 4 days?

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

What is the the greatest common factor ?

For a function f(x), a) if f(7) = 22 then f^-1(22) = b) f^-1(f(c)) =