Which expression is equivalent to -15x + 39 a. -3(5x-13)
b. -3(5x+13)
c. 3(5x-13)
d. 3(5x+13)

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