Can you please answer eight and ten please?

If 3x+8=3x+8 is it one solution or no solution

Define multiplicative inverse. give an example of a number and its multiplicative inverse.

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