Answer:
1. Yes
2. Because by moving the negative sign from the x to the 5 by dividing, the inequality sign has to switch and it'll become x>-5 as well, and vice versa,
3. x > -4
Step-by-step explanation:
For #3:
2.1x + 43.2 > 1.2 - 8.4x
2.1x + 8.4x > 1.2 - 43.2
10.5x > -42
x > -4
