Please answer fast!! What properties are being used in these expressions?

1. (3x+7)+(2x+8)=3x+7+2x+8
2. 3x+7+2x+8=3x+2x+7+8
3. 3x+2x+7+8=(3x+2x)+(7+8)

If lmn=xyz, which congruences are true by cpctc? check all that apply

What can each term of the equation be multiplied by to eliminate the fractions before solving? x – + 2x = + x 2 6 10 12

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