Simplify a-c when a=5,c=-1​

Apath 3 m wide runs around the inside of a square park inside 60 m.find the area of the path.pls

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

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