PLEASE HELP!!! Find the Least Common Multiple of these two monomials: 12a^4b^2c^5 and 40a^3b^7c^1

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

Evaluate 8j -k+148j−k+14 when j=0.25j=0.25 and k=1k=1.

Which radical expression is a rational number? a. √ 360 b. √ 644 c. √ 225 d. √ 122