Please Help :( Find x so that m||n (m is parallel to n). Identify the postulate or theorem you used.

I just need help on 16, 18, and 20. Please

Which graph shows a function with a range of all real numbers greater than or equal to -1

Select the quadratic that has root x = 8 and x = -5

Which shows the correct lengths of side c in both scales? scale 1: 45 m; scale 2: 60 m scale 1: 60 m; scale 2: 45 m scale 1: 36 m; scale 2: 27 m scale 1: 27 m; scale 2: 36 m mark this and return save and exit