5(x squared-3x) in standard form

1. what are the missing reasons in the proof 2. it's in the second picture and 3

Which number produces a rationale number when multiplied by 1/5

Choose the linear inequality that describes the graph. the gray area represents the shaded region. a: y ≤ –4x – 2 b: y > –4x – 2 c: y ≥ –4x – 2 d: y < 4x – 2