Simplify: -8 +2 +3 (-7)

Which of the following expressions is equal to 2x^2+8

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

Lana's family entered a 5-kilometer race lana's average step length is about 0.5 meter how many steps will she need to take the finish