Anyone know the answer?to all 3

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

for ex: the reciprocal of 3/4 is 4/3. it is the opposite.

reciprocal definition:

a mathematical expression or function so related to another that their product is one; the quantity obtained by dividing the number one by a given quantity.

sites: